Dovesnap

- Handle empty FAUCET config at startup
- Handle cold start of host with existing docker networks
- Handle ovs-ofctl returning an error temporarily, reconciling networks
- Upgrade prometheus, grpc, faucet, gauge, faucetconfrpc, certstrap, grafana

- Updated grafana, faucetconfrpc, faucet-certstrap
- Fix stack test, for faucet

- Updated prometheus, grafana, faucet, gauge, faucet-certstrap, faucetconfrpc
- Restructured tests

- VLAN documentation
- Update faucet, gauge, certstrap, faucetconfrpc

- Fix MANIFEST.in to include main.go
- Allow configuration of faucetconfrpc client key
- Upgrade grpc, grafana

- Move non-error OVS debug to trace level
- Add support for setting container/NAT interface MAC prefixes.