Merge branch 'release/13.5.0'

Merge branch 'release/13.2.1'

Merge branch 'release/13.4.0'

Merge branch 'release/13.3.0'

Updated FluentValidations Nuget Package (ThreeMammals#833)

Reducing Warnings from Ocelot (ThreeMammals#743)

Update to support Subprotocols. Solves ThreeMammals#639 (ThreeMammals…

…#642)

Ocelot websocket middleware did not work for STOMP over websocket. After investigation i found out that the issue was with subprotocol and headers that are send and filtered. 

I the end i used ASP.Net core proxy as a reference to solve the issue here:

https://github.com/aspnet/Proxy/blob/3015029f5169b699dfa16bcf85cfc7ca0aaddae7/src/Microsoft.AspNetCore.Proxy/ProxyAdvancedExtensions.cs

So i modified the code to use the way ASP.Net proxy handles this.

Merge branch 'snb83-feature/config_grow_when_merged' into develop

Feature/proxy reason phrase (ThreeMammals#618)

* ThreeMammals#599 started work to proxy reason phrase

* ThreeMammals#599 test for aggregator

ThreeMammals#593 instanciate upstream path template when dynamic rout…

…ing for logging (ThreeMammals#594)