Fix and enable rocksdb.information_schema test

CURRENT_TEST: rocksdb.information_schema

--- /home/psergey/dev-git/10.2/storage/rocksdb/mysql-test/rocksdb/r/information_schema.result   2017-09-21 10:40:03.019962115 +0000

+++ /home/psergey/dev-git/10.2/storage/rocksdb/mysql-test/rocksdb/r/information_schema.reject   2017-11-13 03:52:04.509919990 +0000

@@ -3,26 +3,22 @@

 DROP TABLE IF EXISTS t3;

 select * from INFORMATION_SCHEMA.ROCKSDB_GLOBAL_INFO;

 TYPE   NAME    VALUE

-MAX_INDEX_ID   MAX_INDEX_ID    max_index_id

 CF_FLAGS       0       default [0]

 CF_FLAGS       1       __system__ [0]

 select count(*) from INFORMATION_SCHEMA.ROCKSDB_GLOBAL_INFO;

 count(*)

-3

+2

 select VALUE into @keysIn from INFORMATION_SCHEMA.ROCKSDB_COMPACTION_STATS where CF_NAME = 'default' and LEVEL = 'Sum' and TYPE = 'KeyIn';

 CREATE TABLE t1 (i1 INT, i2 INT, PRIMARY KEY (i1)) ENGINE = ROCKSDB;

 INSERT INTO t1 VALUES (1, 1), (2, 2), (3, 3);

 select * from INFORMATION_SCHEMA.ROCKSDB_GLOBAL_INFO;

 TYPE   NAME    VALUE

-BINLOG FILE    master-bin.000001

-BINLOG POS     1066

-BINLOG GTID    uuid:5

-MAX_INDEX_ID   MAX_INDEX_ID    max_index_id

+MAX_INDEX_ID   MAX_INDEX_ID    256

 CF_FLAGS       0       default [0]

 CF_FLAGS       1       __system__ [0]

 select count(*) from INFORMATION_SCHEMA.ROCKSDB_GLOBAL_INFO;

 count(*)

-6

+3

 set global rocksdb_force_flush_memtable_now = true;

 set global rocksdb_compact_cf='default';

 select case when VALUE-@keysIn >= 3 then 'true' else 'false' end from INFORMATION_SCHEMA.ROCKSDB_COMPACTION_STATS where CF_NAME = 'default' and LEVEL = 'Sum' and TYPE = 'KeyIn';

@@ -66,7 +62,7 @@

 Variable_name  Value

 rocksdb_pause_background_work  ON

 DROP TABLE t3;

-cf_id:0,index_id:267

+cf_id:0,index_id:263

 SET GLOBAL ROCKSDB_PAUSE_BACKGROUND_WORK=0;

 SHOW GLOBAL VARIABLES LIKE 'ROCKSDB_PAUSE_BACKGROUND_WORK';

 Variable_name  Value