Backport latest changes from polkadot staging

[svyatonik]

Looks like new relayer works ok - still going to watch it for another couple of days.

@bkontur I'm not porting #2727, because you've said it is already a port from master :) But if you need something from there in master, please point - I'll port it too

[bkontur]

yes, I have just small nits:

https://github.com/paritytech/parity-bridges-common/pull/2727/files#diff-1059dbc95faa4274ddbe6051c6b0c66a8e297dbbf799ce2867884dd904db2277R5-R6

https://github.com/paritytech/parity-bridges-common/pull/2727/files#diff-9aac78fe025db5c4ca23686baaf581f1c9cdcd279cf8bd673fdec734ce646312R5-R6

and I would move this bridgeId/laneId check:
https://github.com/paritytech/parity-bridges-common/blob/master/modules/xcm-bridge-hub/src/exporter.rs#L88-L98
before PalletAsHaulBlobExporter::<T, I>::validate( and change Unroutable to NotAplicable -> if we dont have configuration for (source, dest), maybe we could have another instance for the same BridgedNetwork and give it a try, we dont need to be strict here and say "we dont allow only one instance for the same BridgedNetwork`

[svyatonik]

yes, I have just small nits:

https://github.com/paritytech/parity-bridges-common/pull/2727/files#diff-1059dbc95faa4274ddbe6051c6b0c66a8e297dbbf799ce2867884dd904db2277R5-R6

https://github.com/paritytech/parity-bridges-common/pull/2727/files#diff-9aac78fe025db5c4ca23686baaf581f1c9cdcd279cf8bd673fdec734ce646312R5-R6

and I would move this bridgeId/laneId check: https://github.com/paritytech/parity-bridges-common/blob/master/modules/xcm-bridge-hub/src/exporter.rs#L88-L98 before PalletAsHaulBlobExporter::<T, I>::validate( and change Unroutable to NotAplicable -> if we dont have configuration for (source, dest), maybe we could have another instance for the same BridgedNetwork and give it a try, we dont need to be strict here and say "we dont allow only one instance for the same BridgedNetwork`

Ok, done. Thank you!

[bkontur]

and this #2733 :)