mininet-2.3.0-bp156.2.6

- Update to upstream 2.3.0 (yes, 2.3.0 is newer than 2.3.0d6 for upstream):
  * adds better Python 3 compatibility
  * updated PIP URL
  * removed unencrypted git protocol use

- With the upgrade to 2.3.0d6 obsoleted these patches:
  * mininet-2.2.1-private-mount.patch
  * mininet-2.2.1-fallback-to-ovs-testcontroller.patch
  * mininet-2.2.1-add-ovs-testcontroller.patch
  * mininet-2.2.1-default-ofport.patch

- Rename back to mininet as it is simple tool only
- Build with just python3 in mind

- Upgraded to version 2.3.0d6.
- Removed previous patches, as they seem to have been merged upstream.
- SPEC remade to conform to python single-spec.
- Enabled tests (but they seem to required a root user).

- Adjust openvswitch dependencies since the openvswitch and openvswitch-dpdk
  packages have been merged into a single 'openvswitch' package.

- Use the openvswitch capabilities as dependencies to accept the
  openvswitch-dpdk packages as well.

- Cherry-pick upstream patches (and one from PR) to fix compatibility
  with latest OVS releases.
  * Add mininet-2.2.1-add-ovs-testcontroller.patch: Take renamed
    ovs-testcontroller into consideration when checking for existing
    OVS controllers.
  * Add mininet-2.2.1-fallback-to-ovs-testcontroller: Fixes previous
    upstream patch to use the ovs-testcontroller if it's present.
  * Add mininet-2.2.1-default-ofport: Adds support for the new OpenFlow
    port if the controller listens to it.

- Initial commit of version 2.2.1
  * Add upstream mininet-2.2.1-private-mount.patch: Fixes mounts
    with newer systemd