Fixing slave_check_before_image_consistency in MTS mode

Summary:
In MTS mode we were not carrying over the cached variable used to
enable the consistency check from rli to workers causing the workers to always
skip the check.

Squash with D15298652

Reviewed By: anirbanr-fb

Differential Revision: D16505567

fbshipit-source-id: 1207a00

mysql-test/suite/rpl/r/rpl_slave_check_before_image_consistency.result

@@ -5,6 +5,7 @@ Note	####	Storing MySQL user name or password information in the master info rep
 [connection master]
 include/rpl_set_gtid_mode.inc
 call mtr.add_suppression("Error_code: 1032");
+call mtr.add_suppression("Error_code: 1756");
 create table t1 (a int primary key, b int, c int) engine = innodb;
 create table t2 (a int unique, b int, c int) engine = innodb;
 create table t3 (a int, b int, c int, key(a)) engine = innodb;

mysql-test/suite/rpl/t/rpl_slave_check_before_image_consistency-slave.opt

@@ -1 +1 @@
---slave_check_before_image_consistency=ON
+--slave_check_before_image_consistency=ON --slave_parallel_workers=8

mysql-test/suite/rpl/t/rpl_slave_check_before_image_consistency.test

@@ -3,6 +3,7 @@ source include/have_binlog_format_row.inc;
 source include/rpl_set_gtid_mode.inc;
 
 call mtr.add_suppression("Error_code: 1032");
+call mtr.add_suppression("Error_code: 1756");
 
 let $engine= innodb;
 

sql/rpl_rli_pdb.cc

@@ -318,6 +318,7 @@ int Slave_worker::init_worker(Relay_log_info * rli, ulong i)
   mts_dependency_refill_threshold= c_rli->mts_dependency_refill_threshold;
   mts_dependency_max_keys= c_rli->mts_dependency_max_keys;
   mts_dependency_order_commits= c_rli->mts_dependency_order_commits;
+  check_before_image_consistency= c_rli->check_before_image_consistency;
 
   DBUG_RETURN(0);
 }