Update msi.py and uuids.py for 2.7.9 releases

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branch : 2.7
Adds missing files to msi.py

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branch : 2.7
Adds missing revocation.crl test file to msi.py

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branch : 2.7
use skipUnless

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branch : 2.7
extra : source : 812f31cbe6be7ca18ee21bea649bafd7ca87c1aa