feat: add get_private_ip to cloud client base

Terraform stores IP details about instance in different format for
OpenStack and AWS.

kypo/cloud_commons/cloud_client_base.py

@@ -9,6 +9,18 @@ class KypoCloudClientBase(ABC):
     """
     Base class for KYPO cloud clients.
     """
+
+    @abstractmethod
+    @staticmethod
+    def get_private_ip(instance_attrs: dict) -> str:
+        """
+        Get IP address of a Terraform instance.
+
+        :param instance_attrs: Terraform instance attributes
+        :return: IP address
+        """
+        pass
+
     @abstractmethod
     def get_terraform_provider(self) -> str:
         """