MXS-2432 Recognize RESET

RESET QUERY CACHE is reported to be a session command, which will
cause it to be sent to all servers. RESET [MASTER|SLAVE] are
classified as write, which will cause them to be sent to the master.

It could be argued that RESET [MASTER|SLAVE] should cause an error
to be sent to the client.

query_classifier/qc_sqlite/sqlite-src-3110100/src/sqliteInt.h

@@ -4099,6 +4099,11 @@ typedef enum mxs_drop
     MXS_DROP_SEQUENCE,
 } mxs_drop_t;
 
+typedef enum mxs_reset
+{
+    MXS_RESET_QUERY_CACHE
+} mxs_reset_t;
+
 typedef enum mxs_set
 {
     MXS_SET_VARIABLES,