The offer volume is shown so traders know how much fiat
they are sending or receiving without having to call getoffer.

Changed the 'Fiat Sent' and 'Fiat Received' column headers
to show which fiat is being transfered, e.g., 'EUR Sent',
'EUR Received'.

Adjusted apitest's trade-simulation-utils.sh to the modified
gettrade output.

A new handleExceptionAsWarning method logs warn(ex.msg) instead of
the full stack trace.

The gRPC interceptor was not using the correct method/ratemeter
map key, and failing to find a rate meter for the server call.

- Fix the rate meter key lookup bug.

- Disable most strict, default call rate meters in tests.
  Made an adjustment to the test harness' scaffold setup so an interceptor
  testing or disabling config file is always picked up by bob and alice
  daemons.

- Set arbitration daemon's registerDisputeAgent rate @ 10/second, so
  it does not interfere with the test harness.  (There is no pre-existing
  arb node appDataDir before that daemon starts.)

Note:  The test harness cannot install the custom rate metering file in
an arb daemon's appDataDir before it starts because there is no dao-setup
file for that node type.

TODO:  Adjust api simulation scripts to interceptor bug fix.

This change replaces the hard coded strings used as keys in
interceptor rate-metering lookup maps.

Now, the fullMethodName defined in each bisq.proto.grpc.* class'
io.grpc.MethodDescriptor is used, not a hard coded String.

For example, the rate metering lookup key for 'GetBalances',
in 'GrpcWalletsService', is the

   fullMethodName = SERVICE_NAME + '/' + "GetBalances",

   where SERVICE_NAME = "io.bisq.protobuffer.Wallets".

Also adjusted affected tests, and tidy'd up interceptor logging.