Merge branch '4.2.x-stable'

Merge pull request rabbitmq#256 from roelrymenants/deadlock

Reverse lock order to avoid deadlock

Merge pull request rabbitmq#256 from roelrymenants/deadlock

Reverse lock order to avoid deadlock

Merge pull request rabbitmq#256 from roelrymenants/deadlock

Reverse lock order to avoid deadlock

Merge pull request rabbitmq#256 from roelrymenants/deadlock

Reverse lock order to avoid deadlock

4.1.1.ci.preview

Merge branch '4.2.x-stable'

[maven-release-plugin] copy for tag v4.1.0

[maven-release-plugin] copy for tag v4.1.0.RC1

Merge pull request rabbitmq#240 from rabbitmq/rabbitmq-server-1085

Add read to topic permission test