Fix test flakiness in rpl.rpl_semi_sync-master_crash_if_active_trxs

Summary:
The test would sometimes fail if the slave's retry count is exhausted
before the master comes up. Set the slave to retry forever instead.

Squash with D5841339

Test Plan: mtr

Reviewers: abhinavsharma

Reviewed By: abhinavsharma

Subscribers: webscalesql-eng@fb.com

Differential Revision: https://phabricator.intern.facebook.com/D7300343

Tasks: T26970848

Signature: 7300343:1521170714:f5fa7323427be4c086d96a8688b654bc396a7ffe

Author: Herman Lee

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

@@ -8,6 +8,7 @@ call mtr.add_suppression("Force shutdown: Semi-sync master is being switched off
 create table t1(a int) engine=innodb;
 include/stop_slave.inc
 SET GLOBAL DEBUG='+d,dont_send_semi_sync_reply';
+CHANGE MASTER TO MASTER_CONNECT_RETRY=0;
 include/start_slave.inc
 insert into t1 values(1);
 ERROR HY000: Lost connection to MySQL server during query

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

@@ -13,6 +13,7 @@ sync_slave_with_master;
 connection slave;
 source include/stop_slave.inc;
 SET GLOBAL DEBUG='+d,dont_send_semi_sync_reply';
+CHANGE MASTER TO MASTER_CONNECT_RETRY=0;
 source include/start_slave.inc;
 
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