mgr/cephadm: Restore client file(s) default SELinux context type

mgr/cephadm: Restore client file(s) default SELinux context type

When cephadm writes client files to hosts, the new files are created in
/tmp/cephadm-<fsid> and then moved to their target directory. This makes
the client files receive the usr_tmp_t context, which is different then
their original context.
mv -Z will set the SELinux security context type of the target file
based on the SELinux policy rules for the target directory.

Fixes: https://tracker.ceph.com/issues/69395
Signed-off-by: zaken <yonatan.zaken.ext@nokia.com>