Have the 'statusbot' service subscribe to the pip install

Instead of having the 'statusbot' service subscribe to the git
repository, have it subscribe to the pip install.

So now we have:
  * statusbot service <- (subscribed to) <- pip install
  * pip install <- (subscribed to) <- vcsrepo

Change-Id: Id87785810ca4846527dbc8a59ef95ff1c5b4efde

manifests/init.pp

@@ -63,7 +63,7 @@ class statusbot(
     hasrestart => true,
     require    => File['/etc/init.d/statusbot'],
     subscribe  => [
-      Vcsrepo['/opt/statusbot'],
+      Exec['install_statusbot'],
       File['/etc/statusbot/statusbot.config'],
     ],
   }