OPENJPA-2790: Convert build from SVN to GIT (#51)

This change ensures that git hashes have a length of 7 (observed different default lengths between different versions of git), and restores the "M" at the end of the revision number to signify "dirty" OpenJPA builds.

Signed-off-by: Joe Grassel <jgrassel@apache.org>
Reviewed-by: Will Dazey <dazeydev.3@gmail.com>
4 files changed