[ovs-dev] [PATCH v3] packaging: Make Fedora spec file CentOS compatible

[Leif Madsen]

This patch v3 is ready for review. I've tested it on various distribution
versions (
https://copr.fedorainfracloud.org/coprs/leifmadsen/ovs-master/build/522596/)
and am satisfied I've accounted for all of the feedback previously received
including:

* reverting changes to Vagrantfile because Fedora 23 still uses
non-versioned package names
* accounting for ability to build python3 on distribution versions that
don't normally have python3 [1]
* making it generally work across everything [2]
* validate I didn't break anything via rpmlint

Let me know if there is anything else I should adjust. I plan to circle
back around and fix up some of the other RPM linting issues in a follow up
patch once this gets merged down.

Thanks!
Leif.

[1] I was asking about making this dynamic in #centos-devel it doesn't
really appear that is an approach that is likely to succeed, so I added a
--with build_python3 flag
[2] Also via #centos-devel and reading up on Python 2/3 spec files, there
isn't really a defacto "support py2/3 and older/newer Fedora versions in
same spec file" method, but that the %define method I've used seems to be
sane