tune_sssd: fix nsswitch.conf changing for new machine

dc-client/tune_sssd.sh

@@ -86,9 +86,15 @@ else
 fi
 
 # TODO: Fedora has special command for change nssswitch.conf
+#passwd:     files sss
+#shadow:     tcb files sss
+#group:      files sss role
+#gshadow:    files sss
 
 if ! grep -q " sss" /etc/nsswitch.conf ; then
-    subst "s| mysql| sss mysql|g" /etc/nsswitch.conf
+    for i in passwd shadow group gshadow ; do
+        subst "s|^\($i:.*\)files\(.*\)|\1files sss\2|g" /etc/nsswitch.conf
+    done
     ( cd /etc ; git diff nsswitch.conf | cat )
 fi