[4.16] PPC: filter out namespaces dir

[shajmakh]

The previous code fails to run PPC when there is a namespace that has a
suffix nodes. ensure filtering the namespace directory to allow PPC to
work when such namespaces exist.

[shajmakh]

/hold
for 4.17 to be merged first

[openshift-ci]

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[openshift-ci]

@shajmakh: 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/e2e-gcp-pao	6f2d3a0	link	true	/test e2e-gcp-pao
ci/prow/e2e-hypershift	6f2d3a0	link	true	/test e2e-hypershift
ci/prow/okd-scos-images	6f2d3a0	link	true	/test okd-scos-images

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