filter: new automatic whitelisting rules and strict/paranoid policies

The 'default' filter policy was based on blacklisting as much as
possible and otherwise allow.

The new 'strict' filter policy will be based on whitelisting as much
as much as possible, using custom defined rules, and otherwise forbid
the ports.

The new 'paranoid' filter policy is equivalent to the 'strict' filter
after having applied the blacklist rules from the 'default' filter.

src/mm-base-manager.c

@@ -1139,7 +1139,9 @@ initable_init (GInitable *initable,
 #endif
 
     /* Create filter */
-    priv->filter = mm_filter_new (priv->filter_policy);
+    priv->filter = mm_filter_new (priv->filter_policy, error);
+    if (!priv->filter)
+        return FALSE;
 
     /* Create plugin manager */
     priv->plugin_manager = mm_plugin_manager_new (priv->plugin_dir, error);