Wait longer for router stress test replicas to start

[smarterclayton]

They were still pulling when the 1 minute timeout hit.

Fixes https://openshift-gce-devel.appspot.com/build/origin-ci-test/pr-logs/pull/19016/test_pull_request_origin_extended_conformance_gce/17838/#conformanceareanetworkingfeaturerouter-the-haproxy-router-converges-when-multiple-routers-are-writing-conflicting-status-suiteopenshiftconformanceparallel

[openshift-ci-robot]

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[openshift-ci-robot]

@smarterclayton: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
ci/openshift-jenkins/extended_conformance_install	2233da0	link	/test extended_conformance_install

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