Adding the ability to release hosts after testing to the app remoting test driver.

This change introduces a new class which will wrap calls to the
ReportIssue API.  This request will be used to tell the service when we
are done with the remote hosts we used for testing so that they can be
cleaned up and the test will receive a fresh instance the next time it
is launched.  I've also moved the logic to create the service urls out
into a separate class which can be used by framework and unit test
code.

Also updates the behavior for 'show-host-availability' so that it can be
used when running tests for debugging info purposes.

Also cleans up some minor cpplint errors.

BUG=

Review URL: https://codereview.chromium.org/1219063002

Cr-Commit-Position: refs/heads/master@{#337155}

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