Fixing the prow config for multicluster test job

[nikhiljindal]

Fixing the prow config for multicluster test job as per comments in #5373

cc @krzyzacy @BenTheElder @G-Harmon

[BenTheElder]

@nikhiljindal I need to make the config test for the cache SSD smarter (ref #5436) to allow you to remove the port it seems, if you put the port back for now we can get the other fix in and I can fix the port in a follow up.

[BenTheElder]

I forgot that we have a naive config test that forces this port on any job with the cache-ssd mounted. I'll have to fix the test... 😞

[nikhiljindal]

Removed cache-ssd mount to resolve error Error in presubmit: pull-kubernetes-multicluster-ingress-test: job uses --cache-ssd and so needs to set ports in spec.

[BenTheElder]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: BenTheElder, nikhiljindal

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[BenTheElder]

Will revisit caching #5436

[nikhiljindal]

As discussed with @BenTheElder, we probably need the cache so need to add the cache mount back and pass "--git-cache=/root/.cache/git" as args.
Will do that as part of #5436

[k8s-ci-robot]

@nikhiljindal: I updated Prow config for you!

In response to this:

Fixing the prow config for multicluster test job as per comments in #5373

cc @krzyzacy @BenTheElder @G-Harmon

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[BenTheElder]

(manual merge because it seems travis wouldn't mark green on github despite being long green on travis... #1342)