Fixed following SonarQube issues:

- Refactor functions to not always return the same value.
  - Rename "cls" to "self" or add the missing "self" parameter.
  - Remove useless assignment to variables.

web/pgadmin/utils/driver/psycopg2/__init__.py

@@ -120,7 +120,7 @@ class Driver(BaseDriver):
 
         return managers[str(sid)]
 
-    def version(cls):
+    def version(self):
         """
         version(...)
 
@@ -135,7 +135,7 @@ class Driver(BaseDriver):
             "Driver Version information for psycopg2 is not available!"
         )
 
-    def libpq_version(cls):
+    def libpq_version(self):
         """
         Returns the loaded libpq version
         """

web/pgadmin/utils/driver/registry.py

@@ -50,15 +50,15 @@ class DriverRegistry(ABCMeta):
     registry = None
     drivers = dict()
 
-    def __init__(cls, name, bases, d):
+    def __init__(self, name, bases, d):
 
         # Register this type of driver, based on the module name
         # Avoid registering the BaseDriver itself
 
         if name != 'BaseDriver':
-            DriverRegistry.registry[_decorate_cls_name(d['__module__'])] = cls
+            DriverRegistry.registry[_decorate_cls_name(d['__module__'])] = self
 
-        ABCMeta.__init__(cls, name, bases, d)
+        ABCMeta.__init__(self, name, bases, d)
 
     @classmethod
     def create(cls, name, **kwargs):