Fix Python install

chef-client was endlessly unpacking python on the system and
not proceeded due to the installed sentinel not existing in our
archive. Fix it up to match what we install.
Update to icehouse tarballs

(cherry picked from commit a524163df7301984baaf787d2e66db561b2bc619)
Merge pull request #8 from dirkmueller/release/stoney/master

Fix Python install