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In order to properly shutdown the docker-compose cluster, after the conformance
test it is necessary to have the original version again. Running the conformance
tests from a clone in subdir with the right branch given by CONFORMANCE_BRANCH
is much easier.

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Reenable scheduler metrics in scalability tests.

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All external types that are not int64 are now marked as int32,
including
IntOrString. Prober is now int32 (43 years should be enough of an initial
probe time for anyone).

Did not change the metadata fields for now.

Update GCE flaky suite

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