mininet-2.2.1-bp152.3.15

- 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