replicaset: add `bootstrap`
@TarantoolBot document
Title: tt replicaset bootstrap bootstraps a Cartridge app or an instance
This patch adds new subcommand for the replicaset module.
tt replicaset bootstrap [flags] <APP_NAME|APP_NAME:INSTANCE_NAME> bootstraps a Cartridge cluster
or an instance.
The command combines two old cartridge-cli commands: setup and join.
Examples:
tt replicaset bootstrap cartridge_app bootstraps the cluster from the default
config file ("replicasets.yml" in the app directory), the file can be specified with --file option.
tt replicaset bootstrap --bootstrap-vshard cartridge_app bootstraps the cluster and vshard.
tt replicaset bootstrap --replicaset replicaset cartridge_app:inst joins the instance "inst" to the replicaset "replicaset".
Part of https://github.com/tarantool/tt/issues/316