openshift.ks: Use /root/.ssh and not ~/.ssh

In configure_access_keys_on_broker, use /root/.ssh instead of ~/.ssh because ~
expands to /tmp in kickstarts, and so the rsync keys weren't being copied to
/etc/openshift.

Thanks to Rich Lucente for the report.
Merge pull request #45 from Miciah/openshift.ks-use-slash-root-instead-of-tilde

openshift.ks: Use /root/.ssh and not ~/.ssh
Removing another used ssh key

In Amazon devenvs we run the Broker and Node on the same machine so there is no
reason to have this logic anymore.
Merge remote-tracking branch 'origin/enterprise-1.2' into enterprise-1.2.z