Using Hostname if external IP is not found

[trepel]

Overview

Openshift Service resource of LoadBalancer type might have EXTERNAL-IP in form of standartd static IP or in form of hostname

See

$ oc get service keycloak -n tools
NAME       TYPE           CLUSTER-IP       EXTERNAL-IP    PORT(S)          AGE
keycloak   LoadBalancer   172.30.137.193   10.0.190.138   8080:31556/TCP   13d

versus

$ oc get service keycloak -n tools
NAME       TYPE           CLUSTER-IP      EXTERNAL-IP                                                               PORT(S)          AGE
keycloak   LoadBalancer   172.30.56.116   a9b2f08c4b3154094ae774fbcbb2e642-1403130510.us-west-2.elb.amazonaws.com   8080:32470/TCP   42m

This PR should allow the testsuite to work if EXTERNAL-IP is configured either way.

Verification Steps

Eye review. You can run a single test that uses keycloak against a cluster backed by Openstack (such clusters use static IP approach) and against another cluster backed by AWS (hostname approach).