Bump up integration2 k8s istio deployment timeout duration.

[incfly]

Why it's 900 seconds, from a previous run,
https://storage.googleapis.com/istio-prow/pr-logs/pull/istio_istio/12481/istio-integ-k8s-tests/4954/build-log.txt

2019-03-13T22:59:55.880239Z info CI Checking pods...
2019-03-13T23:11:03.394889Z info CI === SUCCEEDED: Deploy Istio ===

First Checking pods and finally SUCCEEDED, it's 12 minutes. 900 secs is 15min for safer.

Hopefully once we get #12274 landed, this can be faster.

[istio-testing]

@incfly: The following tests failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
prow/e2e-simpleTests-cni.sh	1a0e20f	link	/test e2e-simpleTests-cni
prow/istio-integ-k8s-tests.sh	1a0e20f	link	/test istio-integ-k8s-tests
prow/e2e-mixer-no_auth.sh	1a0e20f	link	/test e2e-mixer-no_auth
prow/istio-pilot-multicluster-e2e.sh	1a0e20f	link	/test istio-pilot-multicluster-e2e

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[nmittler]

@incfly do we know why it's taking so long on prow? Do we have limited resources available?

[esnible]

@nmittler See #11904 and #11593 and #12431 . Builds using my PR do kubectl describe on pods when tests fail; I noticed the problem was

Warning  FailedScheduling  44s (x57 over 16m)  default-scheduler  0/1 nodes are available: 1 Insufficient cpu.

My PR has gone stale. My hope is that it gets merged to Master soon.

[ozevren]

/lgtm

[istio-testing]

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This pull-request has been approved by: incfly, ozevren

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[istio-testing]

@incfly: PR needs rebase.

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[ozevren]

@incfly Can we close this PR? The new framework uses 20 minutes for the time being, until #12606 can be resolved.

[incfly]

Yeah, we can close it given the tests are passing stably now.