Skip databaseds backends in PyTango compatibility module

PyTango.py

@@ -17,6 +17,9 @@ def alias_package(package, alias, extra_modules={}):
     prefix = package.__name__ + '.'
     # Alias all importable modules recursively
     for _, name, _ in pkgutil.walk_packages(path, prefix):
+        # Skip databaseds backends
+        if name.startswith('tango.databaseds.db_access.'):
+            continue
         try:
             if name not in sys.modules:
                 __import__(name)