improve perf of InMemoryTimeoutPersister
Use the delegate builder to avoid reflection in the databus
Added tests for MsmqConnectionStringBuilder
Moved RetryPolicy check to FaultManager

This allows us to keep the notification error stream as typed exceptions.
Fixed issue with notifications acceptance test would sometimes miss events.
Reusing default SLR settings for both config section and FaultManager.
Added validation rules to SecondLevelRetriesConfig section.
Merge pull request #2509 from Particular/SLR_Refactor

Moved RetryPolicy check to FaultManager
Removing NServiceBus.Testing

Moved to https://github.com/Particular/NServiceBus.Testing

Fixes #2205
Adding InMemoryDatabus that used to be linked from testing
Merge pull request #2487 from Particular/InMemoryTimeoutPersisterPerf

improve perf of InMemoryTimeoutPersister
Merge pull request #2493 from Particular/UseDelegateBuilderInDataBus

Use the delegate builder to avoid reflection in the databus
Correct defaults for suppressing the ambient tx