Fix leaky file descriptor bug on http_output.go
Merge pull request #1173 from didip/close-response-body-08x

Fix leaky file descriptor bug on http_output.go
Stamp packs only when a message matcher succeeds.
Add RWMutex to protect packet tracking metadata from multiple
goroutine access, and fix the refcounting that I broke w/ the first
commit.
Merge pull request #1176 from mozilla-services/pack_diag_match_fix

Pack diag match fix
Issue #1165 Added max_msg_size to StatsdInput for message size.
Merge pull request #1177 from arrrrgh/stable_issue_1165

Added max_msg_size to StatsdInput for message size. Closes #1165.
Always recycle, and CleanupForRestart doesn't need to duplicate what
already happens when Run exits.
Merge pull request #1179 from mozilla-services/amqp_out_always_recycle

Always recycle, and CleanupForRestart doesn't need to duplicate what
Merge branch 'versions/0.8' into dev