Check for permissions on PUT for review request resources.

Review Request #2138 — Created Feb. 18, 2011 and submitted

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Review Board
master

Reviewers

Check for permissions on PUT for review request resources.

We were relying on open/close to check proper permissions when executing
close/reopen, but we'd ideally want to check before going that far. Now
we execute checks in the update handler so we catch things early.
Unit tests pass.