Make create args for scale testing configurable in the run-test.sh

[prateekgogia]

For Kubernetes upstream scale testing in AWS, we are trying to run large number of nodes and CL2 tests.

Creating this PR to get feedback on this approach for configuring test definitions defined here - https://github.com/kubernetes/test-infra/blob/master/config/jobs/kubernetes/kops/kops-presubmits-scale.yaml#L30

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[shyamjvs]

xref kubernetes/test-infra#29139

@justinsb @BenTheElder - can we get your eyes on this one please?

[hakman]

/ok-to-test

[hakman]

@shyamjvs Looks good. Let's merge and iterate.

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[hakman]

In ./tests/e2e/scenarios/scalability/run-test.sh line 128:
if [[ "${RUN_CL2_TEST:-}" == "true" ]]; then
^-- SC1009: The mentioned syntax error was in this if expression.
                                        ^-- SC1073: Couldn't parse this then clause. Fix to allow more checks.


In ./tests/e2e/scenarios/scalability/run-test.sh line 130:
else
^-- SC1048: Can't have empty then clauses (use 'true' as a no-op).
    ^-- SC1072: Unexpected keyword/token. Fix any mentioned problems and try again.

For more information:
  https://www.shellcheck.net/wiki/SC1048 -- Can't have empty then clauses (us...
  https://www.shellcheck.net/wiki/SC1072 -- Unexpected keyword/token. Fix any...
  https://www.shellcheck.net/wiki/SC1073 -- Couldn't parse this then clause. ...

[hakman]

/lgtm cancel

[prateekgogia]

@hakman thanks for the review. I have fixed the shell check warning, PTAL.

[hakman]

@prateekgogia Still some complaints in tests, could you check?

[prateekgogia]

Pushed another change. PTAL, thanks!

[hakman]

@prateekgogia Still failing for some reason...

[prateekgogia]

Sorry about the multiple iterations, looks like tests are passing now.

[hakman]

No worries.

[hakman]

/lgtm