rollback test-infra to bazel 0.14.0

[BenTheElder]

bazelbuild/bazel#5047 (comment)

we're seeing a caching issue again that was in theory fixed in 0.14.0 and one that I had not been seeing until we upgraded to 0.15, and we're seeing it pretty often. this downgrades us back to 0.14.0 until we know more...

/area images
/area bazel
/assign @ixdy @cjwagner @krzyzacy

[cjwagner]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: BenTheElder, cjwagner

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[k8s-ci-robot]

@BenTheElder: Updated the config configmap using the following files:

• key config.yaml using file prow/config.yaml

In response to this:

bazelbuild/bazel#5047 (comment)

we're seeing a caching issue again that was in theory fixed in 0.14.0 and one that I had not been seeing until we upgraded to 0.15, and we're seeing it pretty often. this downgrades us back to 0.14.0 until we know more...

/area images
/area bazel
/assign @ixdy @cjwagner @krzyzacy

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