Fix compatibility with Python 2.6#12

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sysblade wants to merge 9 commits intocrohr:masterfrom

sysblade:master

Commits on Dec 14, 2015

Fix compatibility with Python 2.6
Mathieu Poussin
committed

Commits on Jan 12, 2016

Add batch (headless support)
Mathieu Poussin
committed
Automate RPM signing
Mathieu Poussin
committed
Add batch to gpg
Mathieu Poussin
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Add no-tty
Mathieu Poussin
committed

Commits on Jan 13, 2016

Add auto passphrase for repomd signing
Mathieu Poussin
committed

Commits on Jan 14, 2016

Delete passphrase file after completion
Mathieu Poussin
committed

Commits on Feb 26, 2016

Revert default to sha1
Mathieu Poussin
committed
Merge branch 'master' of https://github.com/kedare/rpm-s3
Mathieu Poussin
committed