cleanup: introduce CF_SKIP_WSREP_CHECK

remove if() over many COM_xxx values

sql/sql_class.h

@@ -4894,6 +4894,11 @@ public:
 */
 #define CF_SKIP_QUESTIONS       (1U << 1)
 
+/**
+  Do not check that wsrep snapshot is ready before allowing this command
+*/
+#define CF_SKIP_WSREP_CHECK     (1U << 2)
+
 void mark_transaction_to_rollback(THD *thd, bool all);
 
 /* Inline functions */