Disable flaky tests on OpenStack
Disable flaky tests on OpenStack

In order to increase chances to get a voting CI for OpenStack soon, I
propose to skip Network Granular Check tests that are intermittently
failing on our infrastructure.

This commit must be reverted and the issue properly investigated once
the minimum result of a voting CI is achieved.

ref.: https://bugzilla.redhat.com/show_bug.cgi?id=1763936
ref.: https://github.com/openshift/origin/pull/24313

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