Fix: replace mkdir with chmod

In original patches, extra mkdir has been added instead of chmod.

https://fedorahosted.org/freeipa/ticket/5520

Reviewed-By: Martin Basti <mbasti@redhat.com>

ipaplatform/base/services.py

@@ -420,7 +420,7 @@ class SystemdService(PlatformService):
             try:
                 if not ipautil.dir_exists(srv_tgt):
                     os.mkdir(srv_tgt)
-                    os.mkdir(srv_tgt, 0o755)
+                    os.chmod(srv_tgt, 0o755)
                 if os.path.exists(srv_lnk):
                     # Remove old link
                     os.unlink(srv_lnk)