daemon: updated session.delete_link to have the interface ids default to none, since only one may need to be provided, updated link tests to account for more cases

daemon/core/api/tlv/corehandlers.py

@@ -788,7 +788,6 @@ class CoreHandler(socketserver.BaseRequestHandler):
         link_options.network_id = message.get_tlv(LinkTlvs.NETWORK_ID.value)
         link_options.key = message.get_tlv(LinkTlvs.KEY.value)
         link_options.opaque = message.get_tlv(LinkTlvs.OPAQUE.value)
-
         if message.flags & MessageFlags.ADD.value:
             self.session.add_link(
                 node_one_id, node_two_id, interface_one, interface_two, link_options

daemon/core/emulator/session.py

@@ -319,8 +319,8 @@ class Session:
         self,
         node_one_id: int,
         node_two_id: int,
-        interface_one_id: int,
-        interface_two_id: int,
+        interface_one_id: int = None,
+        interface_two_id: int = None,
         link_type: LinkTypes = LinkTypes.WIRED,
     ) -> None:
         """