Emit log when copying file/directory permissions

Currently, kolla sets file permissions at _set_properties_from_file()
method, but no logs are emitted here. This can make it
difficult to investigate the cause of issues which are
caused by setting permissions.
This patch makes _set_properties_from_file() output a
log.

Closes-Bug: #1966825
Change-Id: I91116931aa30fd2c5e51ed1ac04663fcfa4a5f36
(cherry picked from commit 4c071fcc3a)

docker/base/set_configs.py

@@ -120,6 +120,7 @@ class ConfigFile(object):
             self._set_properties_from_conf(dest)
 
     def _set_properties_from_file(self, source, dest):
+        LOG.info('Copying permissions from %s onto %s', source, dest)
         shutil.copystat(source, dest)
         stat = os.stat(source)
         os.chown(dest, stat.st_uid, stat.st_gid)