Make mysql.innodb_mysql_lock deterministic

MDEV-7861 main.innodb_mysql_lock fails sporadically in buildbot

mysql-test/main/innodb_mysql_lock.result

@@ -21,6 +21,7 @@ connection con3;
 set @@autocommit=0;
 DROP TABLE t1;
 connection con1;
+# Waiting for until transaction will be locked inside innodb subsystem
 # Connection 1 is now holding the lock.
 # Issuing insert from connection 1 while connection 2&3 
 # is waiting for the lock should give a deadlock error.

mysql-test/main/innodb_mysql_lock.test

+--source include/have_metadata_lock_info.inc
 -- source include/have_innodb.inc
 
 # Save the initial number of concurrent sessions.
@@ -36,10 +37,12 @@ set @@autocommit=0;
 --send DROP TABLE t1
 
 connection con1;
+--echo # Waiting for until transaction will be locked inside innodb subsystem
 let $wait_condition=
-  SELECT COUNT(*) = 1 FROM information_schema.processlist
-  WHERE info = "INSERT INTO t1 VALUES (1)" and 
-  state = "update";
+  SELECT COUNT(*) = 1 FROM information_schema.innodb_trx
+  WHERE trx_query = 'INSERT INTO t1 VALUES (1)' AND
+  trx_operation_state = 'inserting' AND
+  trx_state = 'LOCK WAIT';
 --source include/wait_condition.inc
 let $wait_condition=
   SELECT COUNT(*) = 1 FROM information_schema.processlist