Fix coursier credentials
Changes _repository_credentials to return a string surrounded with quotes as the result is passed to commandline as one of parameters in the form of ... --credentials <result string> and ends up being incorrectly parsed. The quotes enable it to be correctly parsed.
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Sorry for the slow response to your initial PR --- I missed this in my reviews, and only just saw it. I appreciate your patience!
fixed the offending test. The current failures don't seem to be relevant?
@lgzy can you rebase this PR on latest master?
I believe this was fixed with https://github.com/bazelbuild/rules_jvm_external/pull/721 ?