u/fjammes/dm-1338

Reviewing DM-1338
I have big problem with this file in general. It looks like this is going to be sourced from every `init.d` script (via `source_sysconfig`) and these checks are going to be performed by each one of them. This is probably too much to do, I don't see a reason why for example `init.d/xrootd` should be checking for existence of mysql or lua directories (and even worse, fail if they don't exist). In my opinion we should not do that. If you want to do these checks they should be done where they are relevant (check that `${QSERV_RUN_DIR}` exists only in those init.d scripts where it is used).