Use resource kind as OpQuery*'s description

This gives a hint as to what's queried. “QUERY(instance)” or
“QUERY(node)” are way better than just “QUERY”.

Signed-off-by: Michael Hanselmann <hansmi@google.com>
Reviewed-by: René Nussbaumer <rn@google.com>

lib/opcodes.py

@@ -750,6 +750,7 @@ class OpQuery(OpCode):
   @ivar filter: Query filter
 
   """
+  OP_DSC_FIELD = "what"
   OP_PARAMS = [
     _PQueryWhat,
     ("fields", ht.NoDefault, ht.TListOf(ht.TNonEmptyString),
@@ -766,6 +767,7 @@ class OpQueryFields(OpCode):
   @ivar fields: List of fields to retrieve
 
   """
+  OP_DSC_FIELD = "what"
   OP_PARAMS = [
     _PQueryWhat,
     ("fields", None, ht.TOr(ht.TNone, ht.TListOf(ht.TNonEmptyString)),