lib/rplan: remember request context in each query

This doesn't affect any of the objects lifetime, just provides a
convenience for logging as some subsystems take only pointer of queries
not the request object.

lib/rplan.c

@@ -172,6 +172,7 @@ static struct kr_query *kr_rplan_push_query(struct kr_rplan *rplan,
 	/* Class and type must be set outside this function. */
 	qry->flags = rplan->request->options;
 	qry->parent = parent;
+	qry->request = rplan->request;
 	qry->ns.ctx = rplan->request->ctx;
 	qry->ns.addr[0].ip.sa_family = AF_UNSPEC;
 	gettimeofday(&qry->timestamp, NULL);

lib/rplan.h

@@ -96,6 +96,7 @@ struct kr_query {
 	uint32_t uid; /**< Query iteration number, unique within the kr_rplan. */
 	/** Pointer to the query that originated this one because of following a CNAME (or NULL). */
 	struct kr_query *cname_parent;
+	struct kr_request *request; /**< Parent resolution request. */
 };
 
 /** @cond internal Array of queries. */