Implement capability to handle DSA keys to openshift-java-client

The current OpenShift release added support for dsa keys. We have to add this capability to our java client. Alex Boone provided a patch that needs to be merged:

https://github.com/aboone/openshift-java-client/commit/7f7ff6c2e5cf3f617f09e9dcfcf6c72bcac19933#diff-5

This fix is needed since they plan to remove the compatibility guards in the next release.