Fixesscylladb/scylladb#17893
* 'gleb/initial-token-v1' of github.com:scylladb/scylla-dev:
dht: drop unused parameter from get_random_bootstrap_tokens() function
test: add test for initial_token parameter
topology coordinator: use provided initial_token parameter to choose bootstrap tokens
topology cooordinator: propagate initial_token option to the coordinator