more test coverage for X-Forwarded-Proto sanitization
more test coverage for X-Forwarded-Proto sanitization

[#153223820]

Submodule src/code.cloudfoundry.org/gorouter 11d9b6e..973798b:
  > X-Forwarded-Proto tests cover external route services
  > Certs generated for tests have DNS SAN set properly
  > small refactor in basic_integration_test
  > Fixup, add missing test case

cloudfoundry-incubator/cf-routing-release,cloudfoundry-incubator/cf-routing-release,cloudfoundry-incubator/cf-routing-release