Inter-SP communication setup

[redpanda-f]

Currently @rvagg 's work demands inter-SP (curio) communication for Piece replication. However, current setup separates each curio service provider into their own isolated network. This is great for security, but hard for inter-SP communications setup.

Figure out a way for multiple SPs to be able to interact with each other without editing hosts file on the machine. Partly this is attempted here in: #34

[rvagg]

fwiw what I did in #34 seemed to be the best option of the terrible options available and is also something done by others experiencing this same hassle. Making it work across Linux and macOS is also a bit of a hassle, it's possible to make it work on either one with other work-arounds, but not consistently between them, hence that solution as a consistent one.