ef8e320808
Deleting multiple branches from the UI was resulting in a 500 error when branches are in the packed-refs. This was happening because for each branch to be deleted, a separate DELETE request was fired to the server. The concurrent deletion was failing because JGit was not able to lock the pack-ref file to remove the branch from it since the first deletion that was getting executed already locked the file. Add REST API call to delete multiple branches and modify ProjectApi.deleteBranch to use that new call. When multiple branches are deleted from the UI, one request is sent to the server to delete all the selected branches. Bug: issue 2706 Change-Id: I786533eb57048b1c9c67a386f0be37bf1a39853f