Tests: support 'substrate-node' too and allow multiple binary paths #3042

Job	Run time
Cargo check (WASM)	2m 27s
Cargo clippy	5m 20s
Check documentation and run doc tests	12m 45s
Cargo check	5m 41s
Cargo fmt	17s
Test Light Client	3m 35s
Test non-wasm	7m 34s
Test wasm	8m 25s
	46m 4s

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