Make subnets hashable (all legit)

Author: Alan-R

cma/AssimCclasses.py

@@ -1908,7 +1908,7 @@ def sender_key_id(self):
         if not ret:
             # print('Returning None(!)', self.get_framesettype(), file=stderr)
             return None
-        print('SENDER_KEY_ID:', type(ret), ret, file=stderr)
+        # print('SENDER_KEY_ID:', type(ret), ret, file=stderr)
         pyret = u_string_at(ret)
         # print('PYRET:', type(pyret), 'pyret:', pyret, file=stderr)
         return pyret

cma/graphnodes.py

@@ -791,6 +791,18 @@ def __init__(self, domain, ipaddr, cidrmask=None, context=SUBNET_GLOBAL, net_seg
         assert context is None or isinstance(context, str)
         assert not str(self).startswith("::/")
 
+    def __hash__(self) -> int:
+        """
+        Hash our Subnet. The name of a subnet is unique, and is the only thing used by __eq__
+        in comparisions.
+
+        So, it's perfectly legit to hash our name, so we can be put in sets or
+        appear as keys in dicts.
+
+        :return: int: hash of our name
+        """
+        return hash(self.name)
+
     @staticmethod
     def str_to_ip_cidr(ipaddr, cidrmask):
         """