MW-86 Additional wsrep_sync_wait coverage

The following commands are now subject to wsrep_sync_wait
with bitmask value 8:

SHOW BINARY LOGS
SHOW BINLOG EVENTS
SHOW GRANTS

sql/sql_parse.cc

@@ -2805,11 +2805,14 @@ mysql_execute_command(THD *thd)
   case SQLCOM_SHOW_COLLATIONS:
   case SQLCOM_SHOW_STORAGE_ENGINES:
   case SQLCOM_SHOW_PROFILE:
-    WSREP_SYNC_WAIT(thd, WSREP_SYNC_WAIT_BEFORE_SHOW);
   case SQLCOM_SELECT:
    {
-    if (lex->sql_command == SQLCOM_SELECT)
-      WSREP_SYNC_WAIT(thd, WSREP_SYNC_WAIT_BEFORE_READ);
+#ifdef WITH_WSREP
+      if (lex->sql_command == SQLCOM_SELECT)
+        WSREP_SYNC_WAIT(thd, WSREP_SYNC_WAIT_BEFORE_READ)
+      else
+        WSREP_SYNC_WAIT(thd, WSREP_SYNC_WAIT_BEFORE_SHOW)
+#endif /* WITH_WSREP */
 
     thd->status_var.last_query_cost= 0.0;
 
@@ -2933,6 +2936,7 @@ case SQLCOM_PREPARE:
   case SQLCOM_SHOW_RELAYLOG_EVENTS: /* fall through */
   case SQLCOM_SHOW_BINLOG_EVENTS:
   {
+    WSREP_SYNC_WAIT(thd, WSREP_SYNC_WAIT_BEFORE_SHOW);
     if (check_global_access(thd, REPL_SLAVE_ACL))
       goto error;
     res = mysql_show_binlog_events(thd);
@@ -3495,6 +3499,7 @@ case SQLCOM_PREPARE:
     {
       if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
 	goto error;
+      WSREP_SYNC_WAIT(thd, WSREP_SYNC_WAIT_BEFORE_SHOW);
       res = show_binlogs(thd);
       break;
     }
@@ -4778,6 +4783,7 @@ case SQLCOM_PREPARE:
     if (!grant_user)
       goto error;
 
+    WSREP_SYNC_WAIT(thd, WSREP_SYNC_WAIT_BEFORE_SHOW);
     res = mysql_show_grants(thd, grant_user);
     break;
   }

sql/sql_parse.h

@@ -226,8 +226,8 @@ inline bool is_supported_parser_charset(CHARSET_INFO *cs)
          && wsrep_to_isolation_begin(thd, db_, table_, table_list_)) goto error;
 
 #define WSREP_SYNC_WAIT(thd_, before_)                                           \
-    if (WSREP_CLIENT(thd_) &&                                                    \
-        wsrep_sync_wait(thd_, before_)) goto error;
+    { if (WSREP_CLIENT(thd_) &&                                                  \
+          wsrep_sync_wait(thd_, before_)) goto error; }
 
 #else