test: Cleanup build log file

Signed-off-by: Lewis Marshall <lewis@lmars.net>
test: Fix restarting builds

Signed-off-by: Lewis Marshall <lewis@lmars.net>
test: Remove in memory build log

Signed-off-by: Lewis Marshall <lewis@lmars.net>
test: Return after sending http error

Signed-off-by: Lewis Marshall <lewis@lmars.net>
test: Remove CombinedLoggingHandler

Signed-off-by: Lewis Marshall <lewis@lmars.net>
test: Stream pending build logs

Signed-off-by: Lewis Marshall <lewis@lmars.net>
Merge pull request #525 from flynn/ci-pending-build-logs

CI runner fixes