- address dimstars concerns

- Prevent systemd from autogenerating a service file for
openvswitch-switch which conflicts with the opevswitch
one. (bsc#966762)

- Add missing %defattr to ovn files section.

- Add additional install requirements for python-openvswitch-test
package.

- Add support for building both 2.4.0 and 2.5.0 from the same spec
file. Needed to fix SLE11 builds as OVS-2.5.0 no longer supports
python < 2.7. SLE11 SP3 and SP4 use python 2.6.
- Added: openvswitch-2.4.0.tar.gz

- New upstream version 2.5.0 (LTS)
- Dropped support for Python older than version 2.7. As a consequence,
using Open vSwitch 2.5 or later on XenServer 6.5 or earlier (which
have Python 2.4) requires first installing Python 2.7.
- OpenFlow:
* Group chaining (where one OpenFlow group triggers another) is
now supported.
* OpenFlow 1.4+ "importance" is now considered for flow eviction.
* OpenFlow 1.4+ OFPTC_EVICTION is now implemented.
* OpenFlow 1.4+ OFPTC_VACANCY_EVENTS is now implemented.
* OpenFlow 1.4+ OFPMP_TABLE_DESC is now implemented.
* Allow modifying the ICMPv4/ICMPv6 type and code fields.
* OpenFlow 1.4+ OFPT_SET_ASYNC_CONFIG and OFPT_GET_ASYNC_CONFIG are
now implemented.