Upgrade etcd client to v3.5.7 (#183)

* Upgrade etcd client to v3.5.7

* Upgrade more

* Remove bazel

Fix peer namespacing in querywatch function (#182)

Fix deadlock by unlocking in all the places (#173)

Cleanup/deregister a mailbox if we fail to register (#172)

* Cleanup/deregister a mailbox if we fail to register

* Fix the defers and mutex locking in mailboxes

Fix data race-related test failures (PR #171)

Fix grid leader errors (#170)

Avoid panics on not owner errors because they should go away (#169)

* Avoid panics on not owner errors because they should go away

* Apply suggestions from code review

Co-authored-by: Eric Sniff <[email protected]>

Co-authored-by: Eric Sniff <[email protected]>

Add retries to deregister and panic for mailbox (#168)

* Add retries to deregister and panic for mailbox

* Make sure we panic when the actor fails to close its mailbox.

Co-authored-by: Matt Braymer-Hayes <[email protected]>

Deregister on any errors for etcd registration (#167)

Work around etcd/gRPC error weirdness, retract v3.2.4 (PR #166)