Ensure that modo extensions are loaded at startup.

fixes #417

modoboa/core/templates/settings.py

@@ -140,6 +140,12 @@ INSTALLED_APPS = (
     'modoboa',
     'modoboa.auth',
     'modoboa.lib',
+
+    # Extra tools
+    # 'modoboa.tools.pfxadmin_migrate',
+)
+
+MODOBOA_EXTENSIONS = (
     'modoboa.admin',
     'modoboa.userprefs',
 
@@ -150,11 +156,10 @@ INSTALLED_APPS = (
     'modoboa.extensions.stats',
     {% if not amavis_conn %}#{% endif %}'modoboa.extensions.amavis',
     'modoboa.extensions.sievefilters',
-
-    # Extra tools
-    # 'modoboa.tools.pfxadmin_migrate',
 )
 
+INSTALLED_APPS += MODOBOA_EXTENSIONS
+
 AUTH_USER_MODEL = 'admin.User'
 
 AUTHENTICATION_BACKENDS = (

modoboa/extensions/__init__.py

@@ -56,8 +56,10 @@ class ExtensionsPool(object):
     def load_all(self):
         from modoboa.admin.models import Extension
 
+        for ext in settings.MODOBOA_EXTENSIONS:
+            __import__(ext)
         result = []
-        for extname, extdef in self.extensions.iteritems():
+        for extname in self.extensions.keys():
             extinstance = self.get_extension(extname)
             if not extinstance.always_active:
                 try: