move msg.sock from /var/lib/samba to /run/samba

move msg.sock from /var/lib/samba to /run/samba

Move socket directory from /var/lib/samba to /run/samba,
exactly like msg.lock.  This directory is only used by various
samba components to communicate with each other (smbcontrol),
there's no place for it in /var/lib.

Also remove msg.sock subdir in various tests.

It'd be nice to also move ntp socket and similar somewhere to
/run/samba too, but this is a bit more difficult since it is
used in other software.

https://lists.samba.org/archive/samba-technical/2022-April/137322.html

Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Gbp-Pq: Name move-msg.sock-from-var-lib-samba-to-run-samba.patch