Pass --vardir to MTR in mysql-trunk.push.

mysql-test/collections/mysql-trunk.push

-perl mysql-test-run.pl --timer --force --parallel=auto --experimental=collections/default.experimental --comment=n_mix --mysqld=--binlog-format=mixed --suite=main,binlog,innodb,federated,rpl
-perl mysql-test-run.pl --timer --force --parallel=auto --experimental=collections/default.experimental --comment=ps_row --ps-protocol --mysqld=--binlog-format=row --suite=main,binlog,innodb,federated,rpl
-perl mysql-test-run.pl --timer --force --parallel=auto --experimental=collections/default.experimental --comment=embedded --embedded --suite=main,binlog,innodb,federated,rpl
-perl mysql-test-run.pl --timer --force --parallel=auto --experimental=collections/default.experimental --comment=rpl_binlog_row --mysqld=--binlog-format=row --suite=rpl,binlog
-perl mysql-test-run.pl --timer --force --parallel=auto --experimental=collections/default.experimental --comment=funcs_1 --suite=funcs_1
+perl mysql-test-run.pl --timer --force --parallel=auto --experimental=collections/default.experimental --comment=n_mix          --vardir=var-n_mix                        --mysqld=--binlog-format=mixed  --suite=main,binlog,innodb,federated,rpl
+perl mysql-test-run.pl --timer --force --parallel=auto --experimental=collections/default.experimental --comment=ps_row         --vardir=var-ps_row         --ps-protocol --mysqld=--binlog-format=row    --suite=main,binlog,innodb,federated,rpl
+perl mysql-test-run.pl --timer --force --parallel=auto --experimental=collections/default.experimental --comment=embedded       --vardir=var-emebbed        --embedded                                    --suite=main,binlog,innodb,federated,rpl
+perl mysql-test-run.pl --timer --force --parallel=auto --experimental=collections/default.experimental --comment=rpl_binlog_row --vardir=var-rpl_binlog_row               --mysqld=--binlog-format=row    --suite=rpl,binlog
+perl mysql-test-run.pl --timer --force --parallel=auto --experimental=collections/default.experimental --comment=funcs_1        --vardir=var-funcs_1                                                      --suite=funcs_1