bts: Run everything over 127.0.0.1

When the test is executed outside of docker, having to manage all
those different IP addresses while manually starting programs can be
quite cumbersome.  Let's just run everything over localhost, like
we always do with other tests.

Now the only cumbersome command to start is trxcon, as it defaults to
only one TRX and adding additional TRX is rather complicated:

./fake_trx.py --trx TRX1@127.0.0.1:5700/1 --trx TRX2@127.0.0.1:5700/2 --trx TRX3@127.0.0.1:5700/3

Change-Id: Iea8519685da7d73696ce9cc2541e93c45c099828
3 files changed