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Recently, Docker.io imposed container registry pull limits, and we have exceeded them. This has impacted continuous-integration testing in this repository. This change updates our base Go images from those hosted on docker.io to gcr.io in order to circumnavigate pull restrictions. Change-Id: I2a990846b1a49010ff2a403d99413d8162322804 Signed-off-by: Drew Walters <andrew.walters@att.com>