bootstrap: don't make openshift unit wait for kas

[deads2k]

The openshift unit runs after the bootkube unit, so the control plane is up.
We no longer have any need to wait.

Alternative #1658
/assign @wking

[wking]

Checking an unrelated job that failed to install (and so has collected bootstrap logs):

$ curl -s https://storage.googleapis.com/origin-ci-test/logs/release-openshift-origin-installer-e2e-aws-upgrade/543/artifacts/e2e-aws-upgrade/bootstrap/bootkube.service | head -n1
Apr 22 18:31:14 ip-10-0-5-105 bootkube.sh[1507]: Pulling release image...
$ curl -s https://storage.googleapis.com/origin-ci-test/logs/release-openshift-origin-installer-e2e-aws-upgrade/543/artifacts/e2e-aws-upgrade/bootstrap/openshift.service | head -n1
Apr 22 18:31:13 ip-10-0-5-105 openshift.sh[1508]: Waiting for pods in namespace openshift-kube-apiserver...

so this is clearly running before bootkube.service succeeds. Long-term, I'd like to remove openshift.sh and move those manifests over to cluster-bootstrap's post-pod phase (see a stale, early stab at this in #1147). But I don't have a problem with polling these pushed until they go through in the meantime.

/lgtm

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[deads2k]

infra, docker pull

/retest

[deads2k]

docker build strategy

/test all