Faucet

Upgrading to this release may require manual steps, check the [release notes](https://docs.faucet.nz/en/latest/release_notes/1.9.0.html) for more details.

* Decreased config reload time
* BGP config moved from VLAN to router
* Drop deprecated dl_dst ACL output action (use set_fields)
* Automatically enable LLDP for stack ports
* Remove support for python3.4 and earlier
* Upgrade VM image to Ubuntu Bionic
* Upgrade docker images to Alpine 3.9

* Reduce runtime of test suite with more efficient broadcast/LLDP helpers.
* Workaround for NotSequence exception from datadiff.
* Test that VLAN PCP is 0 when external loop protection enabled.

* Upgrade test suite to OVS 2.11.0 from 2.9.2
* Further hardware test fixes by refactoring to single config rewriting function
* Reduce number of Travis jobs required to run tests
* Fix handling of expired LACP association
* Fix flakey 8021X tests
* pytype upgrade to 2019.3.1.

* Fix FaucetString based tests did not command a port up on all ports at beginning of test
* Fix for TunnelTest for non DP ports 1-4
* Fix for 802.1x port not coming back up after port flap
* Handle OFAs that supply redundant exact-match mask
* Prometheus client upgrade to 0.6.0
* Correct lots of stale table ID references in documentation
* Tests run in venv for easier maintenance and troubleshooting
* Tests now compatible with Ubuntu 18.04
* Tests make more efficient use of Travis by not starting unnecessary jobs

* Fix tunnel/tests for TFM switches
* Don't flood CDP
* Add Prometheus variable to signal configuration error
* Prometheus client upgrade to 0.5.0
* Sphinx upgrade to 1.8.4

* Initial support for tunnelling packets via ACLs
* LACP flap/state fixes (expiry was not handled, explicit sync state change from 1 to 0 not handled)
* Fix many hardware test cases and use ebtables to block unwanted test host traffic
* Fix config reload where new port added with unknown status
* Add support for faucet on Ubuntu Cosmic
* Chewie upgraded to 0.0.13