Start old cassandra and scylla nodes one by one #332

Job	Run time
CCM Integration tests (using Nix) / build	13m 10s
CCM Integration tests / build (3.8)	9m 4s
CCM Integration tests / build (3.11)	8m 35s
CCM Integration tests / build (3.12)	8m 3s
	38m 52s

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