Bug 1021462 - Pushing user variables failing if haproxy not installed

* Use same ssh settings as haproxy/bin/ssh
  -o BatchMode=yes -o StrictHostKeyChecking=no -o UserKnownHostsFile=$OPENSHIFT_HOMEDIR/.openshift_ssh/known_hosts
  -F $OPENSHIFT_HOMEDIR/.openshift_ssh/config -i $OPENSHIFT_APP_SSH_KEY
Merge pull request #3964 from jwhonce/bug/1021462

Merged by openshift-bot