apply: fix applying pull-requests when --git-dir is used

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
build: support multiple buildbot definitions

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
query: don't match cover letters for 'committer:' searches

The cover letter never gets comitted so it doesn't have a committer.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
query: respect email-tags

Spotted by Blue Swirl.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>