Fixed following SonarQube issues:

1. Method/Field names should comply with a naming convention.
 2. Conditionals should start on new lines

web/pgadmin/utils/driver/abstract.py

@@ -67,7 +67,7 @@ class BaseDriver(object):
         pass
 
     @abstractmethod
-    def gc(self):
+    def gc_timeout(self):
         pass