Fix dates from RPM SPEC changelog

`make rpm` gives these warnings:

    warning: bogus date in %changelog: Thu Feb 28 2014 Michael DeHaan <michael.dehaan@g.c> - 1.5-0
    warning: bogus date in %changelog: Thu Jul 05 2013 Michael DeHaan <michael.dehaan@g.c> - 1.2-2
    warning: bogus date in %changelog: Thu Aug 6 2012 Michael DeHaan <michael.dehaan@g.c> - 0.7-0

    RPM build errors:
        bogus date in %changelog: Thu Feb 28 2014 Michael DeHaan <michael.dehaan@g.c> - 1.5-0
        bogus date in %changelog: Thu Jul 05 2013 Michael DeHaan <michael.dehaan@g.c> - 1.2-2
        bogus date in %changelog: Thu Aug 6 2012 Michael DeHaan <michael.dehaan@g.c> - 0.7-0
Merge pull request #7225 from ciupicri/devel-rpm-changelog

Fix dates from RPM SPEC changelog
Fixing a bad merge commit in packaging/debian/changelog
Adding an ec2_elb test to re-add an instance that had been removed
Adding a new system_warnings config option to supress warnings
Make concatenating certs robust in urls.py

Add a newline after each certificate file explicitly to avoid problems
with files that do not end with a newline themselves.
Moving display-related functions to new module in utils
Merge pull request #7236 from jcassee/robust-ssl-cert-concat

Make concatenating certs robust in urls.py