Part of #316

Part of #316

Part of #316

@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".