Build #774

Parameters
 landing_candidate
Candidate git repo to test (e.g. lp:~smoser/cloud-init)
 landing_candidate_branch
Git branch name for testing (e.g. master)
 candidate_revision
Hash revision of the branch to test (e.g. c6af5b9a1648c208c82b3a2704668391abadd8ab)
 merge_proposal
URL of merge proposal to process to test (e.g. https://code.launchpad.net/~smoser/cloud-init/+git/cloud-init/+merge/325760)
 use_description_for_commit
Use or not use the merge proposal description as commit message.