Adding paranoia controls to the SPEC files

Make sure that a crowbar user exists and is created only if does not exist at time of installation.

Note: We remove the crowbar user and home directory on removal of the opencrowbar-core package. Should NOT do this on installation of a package update.

Make sure that the crowbar user owns all opencrowbar installed files.

NOTE: We forcefully remove all residual files that were created into the directory tree that is owned by our package when that package is removed.  We clean up all junk on removal.