VIP-Go: Add ruleset test for cron min interval #286

Job	Run time
QTest + Lint: PHP 5.4 - PHPCS stable	29s
QTest: PHP 5.4 - PHPCS lowest	29s
QTest + Lint: PHP latest - PHPCS stable	13s
QTest: PHP latest - PHPCS lowest	16s
	1m 27s

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