tunable_event: extend debug message and tweak limit for remote message

It would be nice to also print a params pointer and number of params in
the debug message and the previous limit for number of params in the rpc
message was too large. The 2048 params will be enough for future events.
Signed-off-by: NPavel Hrdina <phrdina@redhat.com>

daemon/remote.c

@@ -986,8 +986,8 @@ remoteRelayDomainEventTunable(virConnectPtr conn,
         !remoteRelayDomainEventCheckACL(callback->client, conn, dom))
         return -1;
 
-    VIR_DEBUG("Relaying domain tunable event %s %d, callback %d",
-              dom->name, dom->id, callback->callbackID);
+    VIR_DEBUG("Relaying domain tunable event %s %d, callback %d, params %p %d",
+              dom->name, dom->id, callback->callbackID, params, nparams);
 
     /* build return data */
     memset(&data, 0, sizeof(data));

src/remote/remote_protocol.x

@@ -248,7 +248,7 @@ const REMOTE_NETWORK_DHCP_LEASES_MAX = 65536;
 const REMOTE_CONNECT_GET_ALL_DOMAIN_STATS_MAX = 4096;
 
 /* Upper limit of message size for tunable event. */
-const REMOTE_DOMAIN_EVENT_TUNABLE_MAX = 8388608;
+const REMOTE_DOMAIN_EVENT_TUNABLE_MAX = 2048;
 
 /* UUID.  VIR_UUID_BUFLEN definition comes from libvirt.h */
 typedef opaque remote_uuid[VIR_UUID_BUFLEN];