fix assembly tar with long filenames on some platforms

[xvrl]

No description provided.

[guobingkun]

👍 This fixes

[INFO] extensions-distribution ............................ SUCCESS [  7.573 s]
[INFO] distribution ....................................... FAILURE [  1.211 s]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 48.376 s
[INFO] Finished at: 2015-08-19T11:09:04-05:00
[INFO] Final Memory: 112M/1463M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-assembly-plugin:2.5.5:single (distro-assembly) on project distribution: Execution distro-assembly of goal org.apache.maven.plugins:maven-assembly-plugin:2.5.5:single failed: group id '285597778' is too big ( > 2097151 ). Use STAR or POSIX extensions to overcome this limit -> [Help 1]

After running mvn -DskipTests clean package locally.