Improve init script to work with opensuse and fix logic with PID file

The redhat init script is incorrect and does not work with OpenSUSE under systemd. Looking into it, I found that the problem is that the pidfile is not persistent - it is only created upon shutdown and then immediately removed, as a foil for kill proc.

I submitted a patch through the opensuse build system that fixes this problem - it probably should be rolled upstream. The opensuse build request is at https://build.opensuse.org/request/show/223463. I'm not providing a diff here because the diff in the opensuse build file is predicated upon a couple of additional patches. But here is the init script I'm using. It works correctly on opensuse, and should not work incorrectly anywhere else, either.

arguably status() should be a little smarter in checking the pidfile to see if it matches the running process (if there is one), and start() should be a little smarter in checking for an existing pidfile, but I don't have the time to make it completely buttoned down for now...