SPARK-2798 [BUILD] Correct several small errors in Flume module pom.xml files

(EDIT) Since the scalatest issue was since resolved, this is now about a few small problems in the Flume Sink `pom.xml`

- `scalatest` is not declared as a test-scope dependency
- Its Avro version doesn't match the rest of the build
- Its Flume version is not synced with the other Flume module
- The other Flume module declares its dependency on Flume Sink slightly incorrectly, hard-coding the Scala 2.10 version
- It depends on Scala Lang directly, which it shouldn't
The sink does not depend on streaming either. The streaming jar should not even be dependency - even for test only the streaming test jar is required:

[INFO] org.apache.spark:spark-streaming-flume-sink_2.10:jar:1.1.0-SNAPSHOT
[INFO] +- org.apache.flume:flume-ng-sdk:jar:1.4.0:compile
[INFO] |  +- org.apache.avro:avro:jar:1.7.6:compile
[INFO] |  |  +- org.codehaus.jackson:jackson-core-asl:jar:1.9.13:compile
[INFO] |  |  +- org.codehaus.jackson:jackson-mapper-asl:jar:1.8.8:compile
[INFO] |  |  +- com.thoughtworks.paranamer:paranamer:jar:2.3:compile
[INFO] |  |  +- org.xerial.snappy:snappy-java:jar:1.1.1.3:compile
[INFO] |  |  \- org.apache.commons:commons-compress:jar:1.4.1:compile
[INFO] |  |     \- org.tukaani:xz:jar:1.0:compile
[INFO] |  \- org.apache.avro:avro-ipc:jar:1.7.6:compile
[INFO] +- org.apache.flume:flume-ng-core:jar:1.4.0:compile
[INFO] |  +- org.apache.flume:flume-ng-configuration:jar:1.4.0:compile
[INFO] |  +- org.slf4j:slf4j-api:jar:1.7.5:compile
[INFO] |  +- com.google.guava:guava:jar:14.0.1:provided
[INFO] |  +- commons-io:commons-io:jar:2.1:compile
[INFO] |  +- commons-codec:commons-codec:jar:1.5:compile
[INFO] |  +- log4j:log4j:jar:1.2.17:compile
[INFO] |  +- org.slf4j:slf4j-log4j12:jar:1.7.5:compile
[INFO] |  +- commons-cli:commons-cli:jar:1.2:compile
[INFO] |  +- commons-lang:commons-lang:jar:2.5:compile
[INFO] |  +- joda-time:joda-time:jar:2.1:compile
[INFO] |  +- org.mortbay.jetty:servlet-api:jar:2.5-20110124:compile
[INFO] |  +- org.mortbay.jetty:jetty-util:jar:6.1.26:compile
[INFO] |  +- org.mortbay.jetty:jetty:jar:6.1.26:compile
[INFO] |  +- com.google.code.gson:gson:jar:2.2.2:compile
[INFO] |  \- org.apache.mina:mina-core:jar:2.0.4:compile
[INFO] +- org.scala-lang:scala-library:jar:2.10.4:compile
[INFO] +- org.scalatest:scalatest_2.10:jar:2.1.5:test
[INFO] |  \- org.scala-lang:scala-reflect:jar:2.10.4:test
[INFO] \- org.apache.spark:spark-streaming_2.10:test-jar:tests:1.1.0-SNAPSHOT:test
[INFO]    +- org.apache.spark:spark-core_2.10:jar:1.1.0-SNAPSHOT:test
[INFO]    |  +- org.apache.hadoop:hadoop-client:jar:1.0.4:test
[INFO]    |  |  \- org.apache.hadoop:hadoop-core:jar:1.0.4:test
[INFO]    |  |     +- xmlenc:xmlenc:jar:0.52:test
[INFO]    |  |     +- org.apache.commons:commons-math:jar:2.1:test
[INFO]    |  |     +- commons-configuration:commons-configuration:jar:1.6:test
[INFO]    |  |     |  +- commons-collections:commons-collections:jar:3.2.1:test
[INFO]    |  |     |  +- commons-digester:commons-digester:jar:1.8:test
[INFO]    |  |     |  |  \- commons-beanutils:commons-beanutils:jar:1.7.0:test
[INFO]    |  |     |  \- commons-beanutils:commons-beanutils-core:jar:1.8.0:test
[INFO]    |  |     +- commons-el:commons-el:jar:1.0:test
[INFO]    |  |     +- hsqldb:hsqldb:jar:1.8.0.10:test
[INFO]    |  |     \- oro:oro:jar:2.0.8:test
[INFO]    |  +- net.java.dev.jets3t:jets3t:jar:0.7.1:test
[INFO]    |  |  \- commons-httpclient:commons-httpclient:jar:3.1:test
[INFO]    |  +- org.apache.curator:curator-recipes:jar:2.4.0:test
[INFO]    |  |  +- org.apache.curator:curator-framework:jar:2.4.0:test
[INFO]    |  |  |  \- org.apache.curator:curator-client:jar:2.4.0:test
[INFO]    |  |  \- org.apache.zookeeper:zookeeper:jar:3.4.5:test
[INFO]    |  |     \- jline:jline:jar:0.9.94:test
[INFO]    |  +- org.eclipse.jetty:jetty-plus:jar:8.1.14.v20131031:test
[INFO]    |  |  +- org.eclipse.jetty.orbit:javax.transaction:jar:1.1.1.v201105210645:test
[INFO]    |  |  +- org.eclipse.jetty:jetty-webapp:jar:8.1.14.v20131031:test
[INFO]    |  |  |  +- org.eclipse.jetty:jetty-xml:jar:8.1.14.v20131031:test
[INFO]    |  |  |  \- org.eclipse.jetty:jetty-servlet:jar:8.1.14.v20131031:test
[INFO]    |  |  \- org.eclipse.jetty:jetty-jndi:jar:8.1.14.v20131031:test
[INFO]    |  |     \- org.eclipse.jetty.orbit:javax.mail.glassfish:jar:1.4.1.v201005082020:test
[INFO]    |  |        \- org.eclipse.jetty.orbit:javax.activation:jar:1.1.0.v201105071233:test
[INFO]    |  +- org.eclipse.jetty:jetty-security:jar:8.1.14.v20131031:test
[INFO]    |  +- org.eclipse.jetty:jetty-util:jar:8.1.14.v20131031:test
[INFO]    |  +- org.apache.commons:commons-lang3:jar:3.3.2:test
[INFO]    |  +- com.google.code.findbugs:jsr305:jar:1.3.9:test
[INFO]    |  +- org.slf4j:jul-to-slf4j:jar:1.7.5:test
[INFO]    |  +- org.slf4j:jcl-over-slf4j:jar:1.7.5:test
[INFO]    |  +- com.ning:compress-lzf:jar:1.0.0:test
[INFO]    |  +- net.jpountz.lz4:lz4:jar:1.2.0:test
[INFO]    |  +- com.twitter:chill_2.10:jar:0.3.6:test
[INFO]    |  |  \- com.esotericsoftware.kryo:kryo:jar:2.21:test
[INFO]    |  |     +- com.esotericsoftware.reflectasm:reflectasm:jar:shaded:1.07:test
[INFO]    |  |     +- com.esotericsoftware.minlog:minlog:jar:1.2:test
[INFO]    |  |     \- org.objenesis:objenesis:jar:1.2:test
[INFO]    |  +- com.twitter:chill-java:jar:0.3.6:test
[INFO]    |  +- commons-net:commons-net:jar:2.2:test
[INFO]    |  +- org.spark-project.akka:akka-remote_2.10:jar:2.2.3-shaded-protobuf:test
[INFO]    |  |  +- org.spark-project.akka:akka-actor_2.10:jar:2.2.3-shaded-protobuf:test
[INFO]    |  |  |  \- com.typesafe:config:jar:1.0.2:test
[INFO]    |  |  +- io.netty:netty:jar:3.6.6.Final:test
[INFO]    |  |  +- org.spark-project.protobuf:protobuf-java:jar:2.4.1-shaded:test
[INFO]    |  |  \- org.uncommons.maths:uncommons-maths:jar:1.2.2a:test
[INFO]    |  +- org.spark-project.akka:akka-slf4j_2.10:jar:2.2.3-shaded-protobuf:test
[INFO]    |  +- org.json4s:json4s-jackson_2.10:jar:3.2.10:test
[INFO]    |  |  +- org.json4s:json4s-core_2.10:jar:3.2.10:test
[INFO]    |  |  |  +- org.json4s:json4s-ast_2.10:jar:3.2.10:test
[INFO]    |  |  |  \- org.scala-lang:scalap:jar:2.10.4:test
[INFO]    |  |  |     \- org.scala-lang:scala-compiler:jar:2.10.4:test
[INFO]    |  |  \- com.fasterxml.jackson.core:jackson-databind:jar:2.3.1:test
[INFO]    |  |     +- com.fasterxml.jackson.core:jackson-annotations:jar:2.3.0:test
[INFO]    |  |     \- com.fasterxml.jackson.core:jackson-core:jar:2.3.1:test
[INFO]    |  +- colt:colt:jar:1.2.0:test
[INFO]    |  |  \- concurrent:concurrent:jar:1.3.4:test
[INFO]    |  +- org.apache.mesos:mesos:jar:shaded-protobuf:0.18.1:test
[INFO]    |  +- io.netty:netty-all:jar:4.0.23.Final:test
[INFO]    |  +- com.clearspring.analytics:stream:jar:2.7.0:test
[INFO]    |  +- com.codahale.metrics:metrics-core:jar:3.0.0:test
[INFO]    |  +- com.codahale.metrics:metrics-jvm:jar:3.0.0:test
[INFO]    |  +- com.codahale.metrics:metrics-json:jar:3.0.0:test
[INFO]    |  +- com.codahale.metrics:metrics-graphite:jar:3.0.0:test
[INFO]    |  +- org.tachyonproject:tachyon-client:jar:0.5.0:test
[INFO]    |  |  \- org.tachyonproject:tachyon:jar:0.5.0:test
[INFO]    |  +- org.spark-project:pyrolite:jar:2.0.1:test
[INFO]    |  \- net.sf.py4j:py4j:jar:0.8.2.1:test
[INFO]    \- org.eclipse.jetty:jetty-server:jar:8.1.14.v20131031:test
[INFO]       +- org.eclipse.jetty.orbit:javax.servlet:jar:3.0.0.v201112011016:test
[INFO]       +- org.eclipse.jetty:jetty-continuation:jar:8.1.14.v20131031:test
[INFO]       \- org.eclipse.jetty:jetty-http:jar:8.1.14.v20131031:test
[INFO]          \- org.eclipse.jetty:jetty-io:jar:8.1.14.v20131031:test