Handle haproxy reload when no haproxy installed

The handler fires for all when upgrading openssl, but not all systems
have haproxy. This used to be handled in the restart haproxy handler,
but was lost when that handler was collapsted into the reload haproxy
handler.
Merge pull request #699 from blueboxgroup/moar-haproxy-fix

Handle haproxy reload when no haproxy installed