MDEV-14181: rocksdb.rocksdb fails: line 1117: query 'reap' succeeded - should have failed

Fix a race condition in the testcase.

storage/rocksdb/mysql-test/rocksdb/t/disabled.def

@@ -54,7 +54,6 @@ blind_delete_without_tx_api: MDEV-12286: rocksdb.blind_delete_without_tx_api tes
 persistent_cache: Upstream RocksDB bug https://github.com/facebook/mysql-5.6/issues/579
 
 collation: Fails on gcc 4.8 and before,  MDEV-12433
-rocksdb  : Intermittent failures in BB
 unique_sec : Intermittent failures in BB  
 
 # See also storage/rocksdb/mysql-test/rocksdb/suite.pm

storage/rocksdb/mysql-test/rocksdb/t/rocksdb.test

@@ -1107,6 +1107,10 @@ set autocommit = 1;
 update t1 set a = sleep(100) where pk = 1;
 
 --connect (con1,localhost,root,,)
+
+let $wait_condition= select State='User sleep' from information_schema.processlist where id=$con_id;
+--source include/wait_condition.inc
+
 --echo kill query \$con_id;
 --disable_query_log
 eval kill query $con_id;