[merge] catch exceptions while opening /dev/urandom

[John Arbash Meinel]

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This patch is just meant to close this bug:
https://launchpad.net/products/bzr/+bug/56883

It works on the existing patch, only it prefers to catch specifically
IOError and OSError, rather than catching any error.

Also, it might be better if we checked e.errno to be in a specific set
(such as ENOENT), but since the bug report didn't indicate what the
actual error was, I'm just submitting it as is.

John
=:->
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