tiny post-GA tool to reduce exec frequency of periodics

[jmguzik]

UTs are not needed as rules will be adjusted quite frequently if needed and also exec on repo can be treated as test.

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jmguzik

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[openshift-ci-robot]

/test remaining-required

[openshift-ci]

@jmguzik: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/validate-test-infra	f1bdb11	link	false	/test validate-test-infra
ci/prow/e2e	5eb463d	link	true	/test e2e
ci/prow/security	5eb463d	link	false	/test security

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[psalajova]

Can you add README?