feat(offline): Handle commitId properly (#258)

For now it was using master branch even if commitId was set

Also sets commitId for java-web-spring to avoid to depends on 'latest' changes

Change-Id: I91d5192209a1a5fbc29664eab9440722f28e97d7
Signed-off-by: Florent Benoit <fbenoit@redhat.com>