cloud_client: implement node details

Terraform resource attributes are backend specific. Because of that each
cloud client (AWS, OpenStack, ...) must implement this method.

kypo/cloud_commons/__init__.py

 from .cloud_client_base import KypoCloudClientBase
-from .cloud_client_elements import Image, Limits, QuotaSet, Quota, HardwareUsage
+from .cloud_client_elements import Image, Limits, QuotaSet, Quota, HardwareUsage, NodeDetails
 from .exceptions import KypoException, StackException, StackCreationFailed, \
     InvalidTopologyDefinition, StackNotFound
 from .topology_elements import MAN, SecurityGroups, Link, NodeToNodeLinkPair

kypo/cloud_commons/cloud_client_base.py

 from abc import ABC, abstractmethod
 from typing import List
 
-from kypo.cloud_commons.cloud_client_elements import Image, QuotaSet, HardwareUsage, Limits
+from kypo.cloud_commons.cloud_client_elements import Image, NodeDetails, QuotaSet, HardwareUsage, Limits
 from kypo.cloud_commons.topology_instance import TopologyInstance
 
 
@@ -86,6 +86,17 @@ class KypoCloudClientBase(ABC):
         """
         pass
 
+    @abstractmethod
+    def get_node_details(self, terraform_attrs: dict) -> NodeDetails:
+        """
+        Get node details from the Terraform resource attributes.
+        Note, Terraform attributes are backend specific.
+
+        :param terraform_attrs: Terraform resource attributes of the node
+        :return: Node details
+        """
+        pass
+
     @abstractmethod
     def get_console_url(self, node_id: str, console_type: str) -> str:
         """

kypo/cloud_commons/cloud_client_elements.py

@@ -164,3 +164,14 @@ class HardwareUsage:
         return self.vcpu == other.vcpu and self.ram == other.ram and\
             self.instances == other.instances and self.network == other.network and\
             self.subnet == other.subnet and self.port == other.port
+
+
+class NodeDetails:
+    """
+    Defines node (Terraform resource) detail
+    """
+
+    def __init__(self, image_id: str, status: str, flavor: str) -> None:
+        self.image_id = image_id
+        self.status = status
+        self.flavor = flavor