Fix clvmd init script return code when executed as non-root user.

Fix clvmd init script return code when executed as non-root user.

clvmd daemon itself does the right thing when invoked as non-root, by
returning 4.

The patch removes the use daemon function from
/etc/rc.d/init.d/functions that´s unnecessary and has th bad habit to
mask the return codes from the real daemon.

Add a simple and generic check to see if clvmd is executed by root or not.

Our stop/reload/restart paths in the init script are complex and not all
the tools involved in the process are guaranteed to return 4 if executed
by non-root against a process that´s running as root (for example kill
-TERM will return -1 and parsing the output to catch the error is
suboptimal at best).

https://bugzilla.redhat.com/show_bug.cgi?id=553381