sni-proxy: have restart re-create conf

"service openshift-sni-proxy start" caused haproxy conf to be re-created
according to the plugin conf file, but not a restart. This change causes
oo-rebuild-haproxy-sni-proxy to be run either way.

Bug 1161135 - openshift-sni-proxy restart command needs call
'oo-rebuild-haproxy-sni-proxy' function
https://bugzilla.redhat.com/show_bug.cgi?id=1161135