Merge remote-tracking branch 'yanglei-rh/bug2219366'

Signed-off-by: Cleber Rosa <[email protected]>

avocado/utils/network/hosts.py

@@ -48,7 +48,7 @@ class Host:
     """
 
     def __init__(self, host):
-        if isinstance(self, Host):
+        if type(self) == Host:  # pylint: disable=C0123
             raise TypeError("Host class should not be instantiated")
         self.host = host