Allow for tests to run in pre-created NS

[mgencur]

Changes

This builds upon #233 . I'm including the commits from that PR here as well and will remove them later when/if the other PR is merged

• Define -reusenamespace flag
• If the flag is used the test namespace is not created but re-used. The name of the namespace is typically "rekt" followed by a numeric index starting from 0. ( we used similar approach in knative/eventing). The index is increased for each new test.
• If the flag is used then also the "eventshub" installation skips installing RBAC and rather expects the RBAC (ServiceAccount,Role, RoleBinding) to already be created. This will allow for running REKT tests by a user with reduced privileges (project admin)

I tried running the rekt tests from knative/eventing with pre-created namespaces and this flag by a project admin user. The result is:

DONE 747 tests, 8 skipped, 27 failures in 1225.891s

The failures are related to several individual tests which require clusterrole creation. These tests will need to be excluded from the execution.

/kind enhancement

Fixes #192

Release Note

Docs

[pierDipi]

/lgtm

[knative-prow-robot]

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[knative-prow-robot]

@mgencur: PR needs rebase.

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[knative-prow-robot]

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

Test name	Commit	Details	Required	Rerun command
integration-tests_reconciler-test_main	fbb2b50	link	true	/test integration-tests_reconciler-test_main

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[pierDipi]

@mgencur are you still interested in this PR?

[mgencur]

@pierDipi No. Let me close it. If we need it again I can create a new one but it's unlikely.