Fixed '--version' for trove processes/utilities

The trove processes (trove-manage, trove-conductor, trove-api, etc.)
returned an empty string when invoked with --version. They now return
the correct version string.

Change-Id: Ic14597e30928c753eae3090b401fbd66e042b93b
Closes-Bug: #1338767
Merge "Fixed '--version' for trove processes/utilities"