add period to buildbot_suites.bat

mysql-test/collections/buildbot_suites.bat

 if "%MTR_PARALLEL%"=="" set MTR_PARALLEL=%NUMBER_OF_PROCESSORS%
 perl mysql-test-run.pl --verbose-restart --force --suite-timeout=120 --max-test-fail=10 --retry=3  --suite=^
-vcol,gcol,perfschema,^
+vcol,gcol,period,perfschema,^
 main,^
 innodb,^
 versioning,^