GUI: Fix some pylint errors

This fixes the following pylint errors:
************* Module tuned.gtk.gui_plugin_loader
E:145,18: TunedException is not callable (not-callable)
E: 45,11: Undefined variable name 'GTKPluginLoader' in __all__ (undefined-all-variable)

************* Module tuned.gtk.managerException
E: 44, 4: method already defined line 41 (function-redefined)

************* Module tuned.gtk.gui_profile_loader
E:126, 4: method already defined line 95 (function-redefined)

Signed-off-by: Ondřej Lysoněk <olysonek@redhat.com>

tuned/gtk/gui_plugin_loader.py

@@ -33,7 +33,7 @@ import tuned.consts as consts
 import tuned.logs
 import tuned.plugins.repository as repository
 import configobj as ConfigObj
-import tuned.exceptions as TunedException
+from tuned.exceptions import TunedException
 
 from tuned import plugins
 from tuned.utils.plugin_loader import PluginLoader
@@ -42,7 +42,7 @@ from tuned import storage, units, monitors, plugins, profiles, exports, \
 
 import tuned.plugins as Plugins
 
-__all__ = ['GTKPluginLoader']
+__all__ = ['GuiPluginLoader']
 
 global_config_spec = ['dynamic_tuning = boolean(default=%s)'
                       % consts.CFG_DEF_DYNAMIC_TUNING,

tuned/gtk/gui_profile_loader.py

@@ -123,10 +123,6 @@ class GuiProfileLoader(object):
         config.write()
         self._refresh_profiles()
 
-    def _refresh_profiles(self):
-        self.profiles = {}
-        self._load_all_profiles()
-
     def update_profile(
         self,
         old_profile_name,

tuned/gtk/managerException.py

@@ -38,10 +38,8 @@ class ManagerException(Exception):
 
         return repr(self.code)
 
-    def profile_already_exists(self, text):
-        return repr(text)
-
-    def profile_already_exists(self):
-        return repr(self.code)
-
-
+    def profile_already_exists(self, text=None):
+        if text is None:
+            return repr(self.code)
+        else:
+            return repr(text)