Add progress logging to long-running ubuntu-units.sh

Author: VladRassokhin

systemd-build/ubuntu-units.sh

@@ -2,5 +2,8 @@
 
 for type in service socket device mount automount swap target path timer slice scope
 do
+  echo "Processing extension '$type'" >&2
   apt-file search -x  "\.$type$" | grep -v example | grep "systemd"  | grep -v "/test" | sed -E "s#^.+/##g" | sort | uniq
-done
+done
+
+echo "All done" >&2