added grpc api to core-daemon, added get sessions and get session rpc calls

daemon/core/misc/nodeutils.py

@@ -63,6 +63,19 @@ def get_node_class(node_type):
     return _NODE_MAP[node_type]
 
 
+def get_node_type(node_class):
+    """
+    Retrieve the node type given a node class.
+
+    :param class node_class: node class to get type for
+    :return: node type
+    :rtype: core.enumerations.NodeTypes
+    """
+    global _NODE_MAP
+    node_type_map = {v: k for k, v in _NODE_MAP.iteritems()}
+    return node_type_map.get(node_class)
+
+
 def is_node(obj, node_types):
     """
     Validates if an object is one of the provided node types.