Medium: mysql: test properly for failed process start (bnc#823095)

The following doesn't work:

	blah & echo $?

This patch changes that to:

	blah &
	pid=$!
	loop
		if $pid does not exist
			wait $pid to get the exit code and log error
		monitor
		...

PS: add vi formatting note at the end (expand tabs, tab=4sp)