Coopr 567: Split server APIs to separate ports.

I have removed ProvisionerHandler from External API and add this handler to Internal API. Also added 
"PUT /v2/plugins/providertypes/{providertype-id}"
"PUT /v2/plugins/automatortypes/{automatortype-id}"
requests to ProvisionerHandler and removed this requests from SuperadminHandler. For now Internal API handles TaskHandler and ProvisionerHandler. I have done some basic tests with coopr standalone - real cluster provisioning via UI.
Maybe I don't understand the code, but looks like this `ProvisionerHandler` is an external handler?

https://github.com/cybervisiontech/coopr/blob/coopr_567/coopr-server/src/main/java/co/cask/coopr/http/guice/HttpModule.java#L57

```
externalHandlerBinder.addBinding().to(ProvisionerHandler.class);
```