MDEV-8617: Multiple galera tests failures with --ps-protocol

(Additional fixes in 10.0-galera branch)
* Reset THD's PS members before returning when node is
not ready.
* Update galera_suspend_slave.test

mysql-test/suite/galera/t/galera_suspend_slave.test

@@ -30,7 +30,7 @@ CREATE TABLE t1 (f1 INTEGER PRIMARY KEY) ENGINE=InnoDB;
 	exit(0);
 EOF
 
---error ER_UNKNOWN_COM_ERROR,ER_LOCK_WAIT_TIMEOUT
+--error ER_UNKNOWN_COM_ERROR,ER_LOCK_WAIT_TIMEOUT,ER_LOCK_DEADLOCK
 INSERT INTO t1 VALUES (1);
 
 --echo Resuming node_2 ...

sql/sql_parse.cc

@@ -1075,6 +1075,12 @@ bool do_command(THD *thd)
                  "WSREP has not yet prepared node for application use",
                  MYF(0));
       thd->protocol->end_statement();
+
+      /* Performance Schema Interface instrumentation end */
+      MYSQL_END_STATEMENT(thd->m_statement_psi, thd->get_stmt_da());
+      thd->m_statement_psi= NULL;
+      thd->m_digest= NULL;
+
       return_value= FALSE;
       goto out;
     }