Concurrency fixes for prober tests

Fix test issue in Go 1.5

Update validate-cluster.sh

Update to use latest etcd client library

Don't fail kube-down if no MIGs are present

Move kubemark500 to kubernetes-scale

Reverting 18442

increase grace period for elasticsearch cluster to complete master election

Revert whitespace changes introduced by #17940.

Remove ~/repo before moving Cloud SDK components there

This whitespace different is thought to be breaking
the build.

The differences in white space are hypothesized to happen
because trailing whitespace is chomped by some people's
editors but not others.

The trailing whitespace is enough of a difference to make
hack/verify-api-references-docs.sh think that the
docs are not different.

I think this is not caught by presubmits because different
versions of diff are doing different things with trailing
whitespace, even though `-Bw` flags are passed.

Undo unintentional changes to goidl testdata

Introduced by #17940 due to bug.  Bug fixed by #18860.

Fix build

Otherwise, verify-codecgen was saying that the testdata needed to
change for some reason.

Properly set KUBE_GCE_INSTANCE_PREFIX for upgrade jobs in e2e.sh

Added ActiveDeadlineSeconds to jobs

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Manual merge to watch Jenkins.

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exceeding allowed time.

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