- change all multi-token commands to use lists instead of strings: in
some cases special characters were interpreted by the shell, and so
the full command arguments were interpreted. this resulted in the system
not being able to correctly ACK incoming calls, in turn causing calls to
hang up after 30 seconds
- change NODE_ENV to test for sbc-inbound: with NODE_ENV set to production
for the sbc-inbound, feature server registration does not happen quite right
with the redis host, causing calls to bounce
- merge common environment variables: since many of the containers share the
same env vars, this merges those together in a common section which simplifies
updating and debugging these settings
