It's confusing that gas price oracle is used on the
home side of the bridge, as opposed to the foreign one,
because gas price is fixed on POA.
Solution: flip the gas price configuration example between sides
Examples in the git repo could lead to situation when a public node (especially a Kovan public) could drop transaction due to low gas price (0 by default).
In order to reduce number of questions which could appear with usage of examples, the `gas_price` field is initialized with 1 gwei in the corresponding files.
As a part of the original feature request, there was a need
for the bridge to be able to sign its own transactions. However,
this didn't fully materialize in the original patch, and only
configuration parameters were implemented.
Solution: remove these last conflated bits
and make this a pure transport change patch.
Using IPC means bridge has to run alognside the node
on the same machine. This, at times, presents problems
in terms of efficiency or coupling of deployment.
Solution: switch to RPC