Add bitcoincash support for prepare and run scripts, add bitcoincash to testing suite, groundwork for bch-xmr atomic swap protocol

docker/production/bitcoincash/entrypoint.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+set -e
+
+if [[ "$1" == "bitcoin-cli" || "$1" == "bitcoin-tx" || "$1" == "bitcoind" || "$1" == "test_bitcoin" ]]; then
+	mkdir -p "$BITCOIN_DATA"
+
+	chown -h bitcoin:bitcoin /home/bitcoin/.bitcoin
+	exec gosu bitcoin "$@"
+else
+	exec "$@"
+fi