Fix version parsing for Mercurial.

Review Request #3433 — Created Oct. 19, 2012 and submitted — Latest diff uploaded

Information

Review Board
release-1.6.x

Reviewers

Fix version parsing for Mercurial.

Our version parsing was relying upon integers only in the version, and
had a probably incorrect hack for handling "+" in the version number.

Since Mercurial is a Python package following Python versioning rules,
we should be using parse_version comparisons. This is a lot less
fragile, and works with their new 1.4-rc release they just put out
(which completely breaks Review Board today).

This will be needed for an upcoming release soon.
Tested with the new Mercurial 1.4-RC release, which broke us tonight.
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