Adding some mocks for Google, Facebook and Twitter for E2Evalidation

Social mock tests are not executed right now due to 2 issues:
1. Identity extensions related to Social are not in yet.
2. Helios currently does not support loading of environment based startup class.
Fixing a build break
Fixing KRE name for mono in deployment utility
Adding build.sh to MusicStore
Adding cache service to the Ntlm startup
Commenting the external logins from login cshtml to work around a bug

https://github.com/aspnet/HttpAbstractions/issues/115

Also adding a work around for the EF issue.
Handle IBuilder rename to IApplicationBuilder.
Adding an Ntlm variation of the test

Modified the helpers to take in an application host config file to accomodate future needs.
Reacting to a change in the environment variable from ENV -> KRE_ENV