Fix for now: reboot so that all "problem" filesystems are left
unmounted (or manually unmount all of them), then change the context
type of the mountpoint directories to mnt_t:
# chcon -t mnt_t /var/run /var/spool /var/lock
Just for curiousity I had changed context of /var/spool and /var/lock
but not that of /var/run. Guess what? On the next reboot ALL of those three
have been mounted successfully and there have been no complains or denials
on /var/run mounting. The problem appears to be not so simple.