Fixed timing issue in test suite

mysql-test/suite/percona/percona_slow_query_log-long_query_time-master.opt

---slow-query-log-file=percona_slow_query_log-long_query_time.log --long-query-time=2
\ No newline at end of file
+--slow-query-log-file=percona_slow_query_log-long_query_time.log --long-query-time=3

mysql-test/suite/percona/percona_slow_query_log-long_query_time.result

 SELECT sleep(1);
 sleep(1)
 0
-SELECT sleep(3);
-sleep(3)
+SELECT sleep(6);
+sleep(6)
 0
-SELECT sleep(5);
-sleep(5)
+SELECT sleep(10);
+sleep(10)
 0
-set long_query_time=4;
+set long_query_time=8;
 SELECT sleep(1);
 sleep(1)
 0
-SELECT sleep(3);
-sleep(3)
+SELECT sleep(6);
+sleep(6)
 0
-SELECT sleep(5);
-sleep(5)
+SELECT sleep(12);
+sleep(12)
 0
-set long_query_time=2;
 cat MYSQLD_DATADIR/percona_slow_query_log-long_query_time.log | grep -c Query_time
 3

mysql-test/suite/percona/percona_slow_query_log-long_query_time.test

 source include/have_innodb.inc;
 
 SELECT sleep(1);
-SELECT sleep(3);
-SELECT sleep(5);
+SELECT sleep(6);
+SELECT sleep(10);
 
-set long_query_time=4;
+set long_query_time=8;
 
 SELECT sleep(1);
-SELECT sleep(3);
-SELECT sleep(5);
-
-set long_query_time=2;
+SELECT sleep(6);
+SELECT sleep(12);
 
 let $MYSQLD_DATADIR= `select @@datadir`;
 let $cmd = cat $MYSQLD_DATADIR/percona_slow_query_log-long_query_time.log | grep -c Query_time;