make compatibilityChecker robust if v2 api is disabled. dirty fix for #1229#1356

Lokowandtg wants to merge 2 commits intocloudfoundry:maincloudfoundry/cf-java-client:mainfrom

Lokowandtg:v2InfoEndpointLokowandtg/cf-java-client:v2InfoEndpointCopy head branch name to clipboard