Enhance RegistryClient tests

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#1,808 opened on Jun 24, 2019 2 comments 0 reactions 1 assignee Claimed by @louismurerwa View on GitHub

area/jib-core cleanup priority: p4

Description

We should have tests around the RegistryClient network requests. Maybe can make `TestWebServer` take a list of expect-response pairs.

_Originally posted by @briandealwis in https://github.com/GoogleContainerTools/jib/pull/1793/review_comment/create_

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