Support base commit IDs for diff validation.
Review Request #7015 — Created March 6, 2015 and submitted — Latest diff uploaded
The diff validation resource didn't have any support for base commit
IDs, which broke posting diffs against Bitbucket repositories. It now
accepts abase_commit_idfield in the API, which will be passed to
DiffSetManager.create_from_upload.There's also a new capability, so that RBTools can determine whether to
validate diffs when it has abase_commit_idvalue.
Unit tests pass.