Add default network to docker start args

[logicethos]

For me, it defaulted to localhost, which failed to expose the ports externally.

[coveralls]

Coverage remained the same at 52.878% when pulling d607e9c3edbef3229cb2801656bfe93297004576 on logicethos:patch-2 into fd65bbc0d02bf746802d59cb5a09f0d6a097279b on OpenBazaar:master.