node-proxy: Stop on remove, restart in upgrade

Change the openshift-origin-node-proxy package to stop the
openshift-node-web-proxy service that it includes when the package is
removed.

Change openshift-origin-node-proxy to condrestart (restart
if already running) openshift-node-web-proxy when the package is
upgraded.

This commit fixes bug 1060274.
Merge pull request #4741 from Miciah/bug-1060274-node-proxy-stop-on-remove-restart-in-upgrade

Merged by openshift-bot