Libmozevent

Use "/" virtualhost for AMQP by default

Use empty virtualhost for AMQP by default

- pulse: Check if the connection is alive every 7 seconds instead of all the time (16)
- pulse: Support listening on multiple queues and routes on the same pulse connection (19)
- pulse: Support connecting to an AMQP virtual host (22)
- mercurial: Send the revision too along with the Treeherder URL when a try push is done (18)

- Use Taskcluster local configuration - backport from code-review (13)
- Update pre-commit dependencies (14)

- Migrate to Community-TC (10)
- Fix default Taskcluster root URL to match the new firefox-ci deployment
- Stop reading the hosts file to set the Taskcluster root URL

- phabricator: Avoid loading group reviewers (8)
- mercurial: Downgrade log level when a base revision is not available (7)