[PATCH] Add tools check on Linux LNT

[Renato Golin]

Hi Daniel,

This is a patch for a bug a filled a long time ago
(http://llvm.org/bugs/show_bug.cgi?id=14201).

Basically, every new test-suite buildbot that someone sets up, I see
these errors being slowly cleared, and this also happens when we
re-install our own buildbots and forget to reinstall the packages...

I'm not a python expert, but I tried to do in a standard way (whatever
the internet thinks is standard, anyway). The idea is to check for the
packages and fail if they're not there, but be completely transparent
if they are.

This is Linux only, as I have no idea how to make that work on Windows
and I can't check its validity on OSX.

Please, review.

cheers,
--renato
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