Add proto v2 archive command with HTTP support

From: Josh Steadmon <steadmon@google.com>
Date: Sep 12, 2018, 05:35 UTC
Message-ID: <20180912053519.31085-1-steadmon@google.com>

This series adds a new protocol v2 command for archiving, and allows this command to work over HTTP(S). This was previously discussed in [1]. I've CCed everyone who participated in that discussion.

[1]: https://public-inbox.org/git/CANq=j3tK7QeBJOC7VNWkh4+WBNibMJJp5YUkd9te5NaYwukAow@mail.gmail.com/

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