setup.bash needs to check for existing networks?

[pauljherring]

Or have I done something silly?

:~/src/nodebb/tdwtf$ ./setup.bash 
Docker version OK..
[sudo] password for pherring: 
Using default tag: latest
latest: Pulling from boomzillawtf/tdwtf
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Digest: sha256:6e8f73a8c98819b74064a2c139c4e0d052d4b54647b753362f071cbbb3b7db6d
Status: Downloaded newer image for boomzillawtf/tdwtf:latest
Error response from daemon: network with name wtdwtf already exists