Merge branch 'rabbitmq-server-1434' into v3.7.x

Merge pull request rabbitmq#1374 from rabbitmq/rabbitmq-server-995

An option to discard messages if queue is full.

Remove inline comments from example systemd service file

References rabbitmq#1422.

Merge pull request rabbitmq#1413 from rabbitmq/mk-dont-throw-when-con…

…nection-pid-is-non-local

Make rabbit_networking:close_connection/2 more benign

Merge pull request rabbitmq#1413 from rabbitmq/mk-dont-throw-when-con…

…nection-pid-is-non-local

Make rabbit_networking:close_connection/2 more benign

Merge pull request rabbitmq#1412 from rabbitmq/rabbitmq-server-1411

Accept strings and atoms for queue_master_locator setting

Merge pull request rabbitmq#1382 from rabbitmq/rabbitmq-server-1379

Do not limit paging to disk if hibernated or resumed after credit

Merge branch 'stable'

Make it possible to configure randomized startup delay range via new …

…style config

Merge pull request rabbitmq#1347 from rabbitmq/autoheal-deadlock

Link process responsible of restart during autoheal, and abort if needed