Bugfix in webui plugin

Avoid useless impossible import by putting confpsec in a dedicated file

install/loader.py

 # Loading settings
 #
 from lodel.settings.settings import Settings as settings
-settings('conf.d')
+if not settings.started():
+    settings('conf.d')
 from lodel.settings import Settings
 
 #Starts hooks

plugins/webui/__init__.py

-from lodel.settings.validator import SettingValidator
-
 __loader__ = 'main.py'
-
-CONFSPEC = {
-    'lodel2.webui': {
-        'standalone': ( False,
-                        SettingValidator('bool')),
-        'listen_address': ( '127.0.0.1',
-                            SettingValidator('dummy')),
-        'listen_port': (    '9090',
-                            SettingValidator('int')),
-    },
-    'lodel2.webui.sessions': {
-        'directory': (  '/tmp/lodel2_session',
-                        SettingValidator('path')),
-        'expiration': ( 900,
-                        SettingValidator('int')),
-        'file_template': (  'lodel2_%s.sess',
-                            SettingValidator('dummy')),
-    }
-}
+__confspec__ = 'confspec.py'

plugins/webui/confspec.py

+from lodel.settings.validator import SettingValidator
+
+CONFSPEC = {
+    'lodel2.webui': {
+        'standalone': ( False,
+                        SettingValidator('bool')),
+        'listen_address': ( '127.0.0.1',
+                            SettingValidator('dummy')),
+        'listen_port': (    '9090',
+                            SettingValidator('int')),
+    },
+    'lodel2.webui.sessions': {
+        'directory': (  '/tmp/lodel2_session',
+                        SettingValidator('path')),
+        'expiration': ( 900,
+                        SettingValidator('int')),
+        'file_template': (  'lodel2_%s.sess',
+                            SettingValidator('dummy')),
+    }
+}