HBASE-8438 Extend bin/hbase to print a "mapreduce classpath"

$ ./bin/hbase mapredcp --help
Usage: hbase mapredcp [-Dtmpjars=...]
  Construct a CLASSPATH containing dependency jars required to run a mapreduce
  job. By default, includes any jars detected by TableMapReduceUtils. Provide
  additional entries by specifying a comma-separated list in tmpjars.

$ ./bin/hbase mapredcp | tr ':' '\n'
/private/tmp/hbase-0.94.14-SNAPSHOT/hbase-0.94.14-SNAPSHOT.jar
/private/tmp/hbase-0.94.14-SNAPSHOT/lib/protobuf-java-2.4.0a.jar
/private/tmp/hbase-0.94.14-SNAPSHOT/lib/zookeeper-3.4.5.jar
/private/tmp/hbase-0.94.14-SNAPSHOT/lib/guava-11.0.2.jar
/private/tmp/hbase-0.94.14-SNAPSHOT/lib/hadoop-core-1.0.4.jar


git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.94@1542816 13f79535-47bb-0310-9956-ffa450edef68