Launchpad: change to Launchpad's read-only time on 2nd June

[Matthew Revell]

We've had to alter the times between which Launchpad's web interface
will be read-only, while everything else is offline, for the release
of Launchpad 10.05.

New start time: 11.00 UTC 2nd June 2010
New end time: 14.00 UTC 2nd June 2010

I'm sorry for the short notice of this change.

-- 
Matthew Revell -- https://launchpad.net/~matthew.revell
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