Exclude hadoop-common snapshot dependency from pom.xml

Currently test (maybe arbitrary) fails on Travis-CI.

`hadoop-hdfs-test:0.22.0:test` depends on `hadoop-hdfs:0.22.0`. And `hadoop-hdfs:0.22.0` depends on `hadoop-common:0.22.0-SNAPSHOT`. But it seemt to `hadoop-common:0.22.0-SNAPSHOT` is not possible to resolve in Travis-CI. Check more information about [hadoop-hdfs-test] and [hadoop-hdfs] artifacts from maven central repository.

"404 - GroupItemNotFoundException" error can be seen when tries to get `hadoop-common:0.22.0-SNAPSHOT` from central snapshot repository:
https://repository.apache.org/snapshots/org/apache/hadoop/hadoop-common/0.22.0-SNAPSHOT/hadoop-common-0.22.0-SNAPSHOT.pom

There is similar issue can be found on hadoop-mapreduce-dev mailing list:
http://mail-archives.apache.org/mod_mbox/hadoop-mapreduce-dev/201206.mbox/%3CCBF75E52.128E%25nishchay.p@inmobi.com%3E

Haeinsa already depends on `hadoop-common`, so we can exclude `hadoop-common` from `hadoop-hdfs-test` dependency for not to use SNAPSHOT release.


[hadoop-hdfs-test]: http://mvnrepository.com/artifact/org.apache.hadoop/hadoop-hdfs-test/0.22.0
[hadoop-hdfs]: http://mvnrepository.com/artifact/org.apache.hadoop/hadoop-hdfs/0.22.0