Change base osmo packages from latest to installed

this is pending update to new latest, these packages are not available anymore
on the osmocom feed.

modules/rhizo_base/manifests/osmocom.pp

@@ -115,7 +115,7 @@ class rhizo_base::osmocom::common {
                'libosmo-mgcp-client9', 'libosmoabis10',
                'libosmonetif8', 'libosmotrau2',
                'osmo-stp', 'libgtp6', 'osmo-mgw' ]:
-      ensure   => 'latest',
+      ensure   => 'installed',
       require  => Class['rhizo_base::apt']
     }