Fix multi collator setup (#133)

* Start

* Fix compilation

* Fix chainspec

* Don't set best 2 times for the same block

* Check the status of a block before building on it

* Check that the block exists before setting it as the new best

* Reorder code

* Fork choice depends on sync status

* Switch branch again

test/parachain/src/service.rs

@@ -123,6 +123,7 @@ pub fn run_collator(
 		proposer_factory,
 		inherent_data_providers,
 		block_import,
+		client.clone(),
 		id,
 		client,
 		announce_block,