Run go test on Travis

- Fix config sample for proper working etcd_servers section
- Include basic config.test.ini which uses our public etcd server for discovery
- Run the test on travis
- Set memcached to load on travis

@jrconlin, @kitcambridge: r?
Yup, or one should change config.test.ini locally. I'm going to change this to let you specify a different config file optionally so that no one needs to worry about accidentally checking in their changes.