Submit exchange transactions to PoA node (#229)

* submit Eth exchange transactions

* submit ethereum in docker-compose

* submit Eth exchange transactions

* fix duplicate message

* fix relay script

* lost file

* cargo fmt --all

* cargo +nightly clippy

* Show sccache

* remove test-helpers remains

* what's going on with jsonrpsee + Cargo.lock?

* relay-eth-submit-exchange-tx -> poa-exchange-tx-generator

* Update relays/ethereum/src/main.rs

Co-authored-by: Tomasz Drwięga <tomusdrw@users.noreply.github.com>

* configuring exchange-gen loop using env variables

* fixed signer account from dev chain to Arthur

* improve debug prints

* parse nonce from relay output

* --eth-nonce=

* fix compilation

* cargo fmt --all

* fix typo

* duplicate relay output to tty

* allow using from bash scripts tests

* fix: U256::parse() expects hex string :/

* cargo fmt --all

* BRIDGE_HASH: ${BRIDGE_HASH:-master}

* script comment

* generate exchange PoA transactions by Bertha

* Bertha address

Co-authored-by: Denis S. Soldatov aka General-Beck <general.beck@gmail.com>
Co-authored-by: Tomasz Drwięga <tomusdrw@users.noreply.github.com>

bridges/primitives/ethereum-poa/src/lib.rs

@@ -54,7 +54,6 @@ pub type RawTransactionReceipt = Vec<u8>;
 /// An ethereum address.
 pub type Address = H160;
 
-#[cfg(any(feature = "test-helpers", test))]
 pub mod signatures;
 
 /// Complete header id.
@@ -113,8 +112,7 @@ pub struct Transaction {
 }
 
 /// Unsigned portion of ethereum transaction.
-#[derive(PartialEq, RuntimeDebug)]
-#[cfg_attr(test, derive(Clone))]
+#[derive(Clone, PartialEq, RuntimeDebug)]
 pub struct UnsignedTransaction {
 	/// Sender nonce.
 	pub nonce: U256,
@@ -396,7 +394,6 @@ impl SealedEmptyStep {
 	}
 
 	/// Returns rlp for the vector of empty steps (we only do encoding in tests).
-	#[cfg(feature = "test-helpers")]
 	pub fn rlp_of(empty_steps: &[SealedEmptyStep]) -> Bytes {
 		let mut s = RlpStream::new();
 		s.begin_list(empty_steps.len());