1. Fix storing issue in JGitConfigImpl
2. Commit command scenario - Get gerrit changid property from configuration
and set the commit command to set insert change ID to work with Gerrit
3. Push command scenario - Create PushResponse with details regarding updates
and refs and use it in push command
Change-Id: Ic54109810cdc6ba026447f691759ef0fc94924d0
Signed-off-by: Offer Shostak <offershostak@gmail.com>