e2e: latency: skip the tests earlier in the suite

[shajmakh]

This suite works properly only if the test executable exists. Currently each test checks for the existence of this common executable. The suite performs some setup steps that are relevant for this set of tests, without considering whether the file exists or not. To avoid extra unneeded execution time, skip the suite at an early stage if the executable file does not exist.

[openshift-ci[bot]]

@shajmakh: No Bugzilla bug is referenced in the title of this pull request. To reference a bug, add 'Bug XXX:' to the title of this pull request and request another bug refresh with /bugzilla refresh.

In response to [this](https://github.com/openshift-kni/performance-addon-operators/pull/930): >e2e: latency: skip the tests earlier in the suite Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.

[openshift-ci[bot]]

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[coveralls]

Pull Request Test Coverage Report for Build 2583

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 60.532%

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Totals
Change from base Build 2567:	0.0%
Covered Lines:	1592
Relevant Lines:	2630

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💛 - Coveralls

[shajmakh]

/hold do not merge until 4.11 batch is merged: https://github.com/openshift/cluster-node-tuning-operator/pull/429

[shajmakh]

following the conversation here and on the team channel, using defere() will not always clean up the env in case of interruptions and/or assertion failures, thus closing this pr in favor of #938 that introduce another alternative skipping method while preserving the before/afterSuites