Add --parallel=auto to collection files which don't currently have it.

mysql-test/collections/default.weekly

-perl mysql-test-run.pl --timer --force --comment=1st       --experimental=collections/default.experimental 1st
-perl mysql-test-run.pl --timer --force --comment=big-tests --experimental=collections/default.experimental --vardir=var-big-tests --big-test --testcase-timeout=60 --suite-timeout=600 large_tests.alter_table main.alter_table-big main.archive-big main.count_distinct3 main.create-big main.events_stress main.events_time_zone main.information_schema-big main.log_tables-big main.merge-big main.mysqlbinlog_row_big main.read_many_rows_innodb main.ssl-big main.sum_distinct-big main.type_newdecimal-big main.variables-big parts.part_supported_sql_func_innodb parts.partition_alter1_1_2_innodb parts.partition_alter1_1_2_ndb parts.partition_alter1_1_ndb parts.partition_alter1_2_innodb parts.partition_alter1_2_ndb parts.partition_alter2_1_1_innodb parts.partition_alter2_1_2_innodb parts.partition_alter2_2_2_innodb parts.partition_alter4_innodb rpl_ndb.rpl_truncate_7ndb_2
+perl mysql-test-run.pl --timer --force --parallel=auto --comment=1st       --experimental=collections/default.experimental 1st
+perl mysql-test-run.pl --timer --force --parallel=auto --comment=big-tests --experimental=collections/default.experimental --vardir=var-big-tests --big-test --testcase-timeout=60 --suite-timeout=600 large_tests.alter_table main.alter_table-big main.archive-big main.count_distinct3 main.create-big main.events_stress main.events_time_zone main.information_schema-big main.log_tables-big main.merge-big main.mysqlbinlog_row_big main.read_many_rows_innodb main.ssl-big main.sum_distinct-big main.type_newdecimal-big main.variables-big parts.part_supported_sql_func_innodb parts.partition_alter1_1_2_innodb parts.partition_alter1_1_2_ndb parts.partition_alter1_1_ndb parts.partition_alter1_2_innodb parts.partition_alter1_2_ndb parts.partition_alter2_1_1_innodb parts.partition_alter2_1_2_innodb parts.partition_alter2_2_2_innodb parts.partition_alter4_innodb rpl_ndb.rpl_truncate_7ndb_2

mysql-test/collections/test-bt

-perl mysql-test-run.pl --force --timer --comment=normal  --skip-ndbcluster --report-features --experimental=collections/default.experimental
-perl mysql-test-run.pl --force --timer --comment=ps --skip-ndbcluster --ps-protocol --experimental=collections/default.experimental
-perl mysql-test-run.pl --force --timer --comment=funcs1+ps  --suite=funcs_1 --ps-protocol --experimental=collections/default.experimental
-perl mysql-test-run.pl --force --timer --comment=funcs2     --suite=funcs_2 --experimental=collections/default.experimental
-perl mysql-test-run.pl --force --timer --comment=partitions --suite=parts   --experimental=collections/default.experimental
-perl mysql-test-run.pl --force --timer --comment=stress     --suite=stress  --experimental=collections/default.experimental
-perl mysql-test-run.pl --force --timer --comment=jp         --suite=jp      --experimental=collections/default.experimental
-perl mysql-test-run.pl --force --timer --comment=embedded  --embedded-server --skip-rpl --skip-ndbcluster --experimental=collections/default.experimental
-perl mysql-test-run.pl --force --timer --comment=nist --suite=nist --experimental=collections/default.experimental
-perl mysql-test-run.pl --force --timer --comment=nist+ps --suite=nist --ps-protocol --experimental=collections/default.experimental
+perl mysql-test-run.pl --force --timer --parallel=auto --comment=normal  --skip-ndbcluster --report-features --experimental=collections/default.experimental
+perl mysql-test-run.pl --force --timer --parallel=auto --comment=ps --skip-ndbcluster --ps-protocol --experimental=collections/default.experimental
+perl mysql-test-run.pl --force --timer --parallel=auto --comment=funcs1+ps  --suite=funcs_1 --ps-protocol --experimental=collections/default.experimental
+perl mysql-test-run.pl --force --timer --parallel=auto --comment=funcs2     --suite=funcs_2 --experimental=collections/default.experimental
+perl mysql-test-run.pl --force --timer --parallel=auto --comment=partitions --suite=parts   --experimental=collections/default.experimental
+perl mysql-test-run.pl --force --timer --parallel=auto --comment=stress     --suite=stress  --experimental=collections/default.experimental
+perl mysql-test-run.pl --force --timer --parallel=auto --comment=jp         --suite=jp      --experimental=collections/default.experimental
+perl mysql-test-run.pl --force --timer --parallel=auto --comment=embedded  --embedded-server --skip-rpl --skip-ndbcluster --experimental=collections/default.experimental
+perl mysql-test-run.pl --force --timer --parallel=auto --comment=nist --suite=nist --experimental=collections/default.experimental
+perl mysql-test-run.pl --force --timer --parallel=auto --comment=nist+ps --suite=nist --ps-protocol --experimental=collections/default.experimental

mysql-test/collections/test-bt-debug

-perl mysql-test-run.pl --force --timer --comment=debug --skip-ndbcluster --skip-rpl --report-features --experimental=collections/default.experimental
+perl mysql-test-run.pl --force --timer --parallel=auto --comment=debug --skip-ndbcluster --skip-rpl --report-features --experimental=collections/default.experimental

mysql-test/collections/test-bt-fast

-perl mysql-test-run.pl --force --timer --comment=ps  --skip-ndbcluster --ps-protocol --report-features --experimental=collections/default.experimental
-perl mysql-test-run.pl --force --timer --comment=stress --suite=stress --experimental=collections/default.experimental
+perl mysql-test-run.pl --force --timer --parallel=auto --comment=ps  --skip-ndbcluster --ps-protocol --report-features --experimental=collections/default.experimental
+perl mysql-test-run.pl --force --timer --parallel=auto --comment=stress --suite=stress --experimental=collections/default.experimental