constants: confd query types

Initially confd will support only two queries:

CONFD_REQ_NODE_ROLE_BYNAME
Given a node name, return its role.

CONFD_REQ_NODE_PIP_BY_INSTANCE_IP
Given an instance ip, return its node primary ip.
This rather weird query is the basis for ganeti nbma lookup.

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Michael Hanselmann <hansmi@google.com>

lib/constants.py

@@ -617,3 +617,14 @@ NICC_DEFAULTS = {
   }
 
 MASTER_POOL_SIZE_DEFAULT = 10
+
+CONFD_PROTOCOL_VERSION = 1
+
+CONFD_REQ_NODE_ROLE_BYNAME = 1
+CONFD_REQ_NODE_PIP_BY_INSTANCE_IP = 2
+
+CONFD_REQS = frozenset([
+  CONFD_REQ_NODE_ROLE_BYNAME,
+  CONFD_REQ_NODE_PIP_BY_INSTANCE_IP,
+  ])
+