logind: allow two very close error messages to be distinguished

logind: allow two very close error messages to be distinguished

In https://bugzilla.redhat.com/show_bug.cgi?id=1486859 error messages appera:

Sep 06 19:09:07 ld92.e.math.uh.edu audit[21482]: AVC avc:  denied  { read } for  pid=21482 comm="elogind-logind" name="dbus-1" dev="tmpfs" ino=5548194 scontext=system_u:system_r:elogind_logind_t:s0 tcontext=unconfined_u:object_r:session_dbusd_tmp_t:s0 tclass=dir permissive=0
Sep 06 19:09:07 ld92.e.math.uh.edu elogind-logind[21482]: Failed to remove runtime directory /run/user/8664: Permission denied

But it's not clear which of the two rm_rf's is the source. Let's make
them different.