new command: tt replicaset expel

[TarantoolBot]

Product: tt CLI
Since: 2.2+ (not released yet)
Root document:

• a new page in https://www.tarantool.io/en/doc/latest/reference/tooling/tt_cli/commands/
• https://www.tarantool.io/en/doc/latest/reference/tooling/tt_cli/cluster/

SME: @ oleg-jukovec @ psergee

Details

To do together with other tt replicaset documentation tasks, see #3850.

The patch introduces a new command for the tt replicaset module:

• tt replicaset expel APP_NAME:INSTANCE_NAME - to expel an instance
  from a cluster.

The command automatically determines a replicaset orchestrator.
Currently, it supports:

• cartridge - the Cartridge orchestrator for Tarantool <= 2.
• config - the centralized config orchestrator for Tarantool >= 3.

Usage:

tt replicaset expel [--cartridge|--config|--custom] <APP_NAME:INSTANCE_NAME>

The example of execution:

$ tt replicaset expel myapp:instance-003
   • Discovery application...

Orchestrator:      centralized config
Replicasets state: bootstrapped

• replicaset-001
  Failover: off
  Master:   single
    • instance-001 unix/:./instance-001.iproto rw
    • instance-002 unix/:./instance-002.iproto read
    • instance-003 unix/:./instance-003.iproto read
• replicaset-002
  Failover: off
  Master:   multi
    • instance-004 unix/:./instance-004.iproto rw
    • instance-005 unix/:./instance-005.iproto rw

   • Expel instance: instance-003
   • Done.
$ tt replicaset status myapp
Orchestrator:      centralized config
Replicasets state: bootstrapped

• replicaset-001
  Failover: off
  Master:   single
    • instance-001 unix/:./instance-001.iproto rw
    • instance-002 unix/:./instance-002.iproto read
• replicaset-002
  Failover: off
  Master:   multi
    • instance-004 unix/:./instance-004.iproto rw
    • instance-005 unix/:./instance-005.iproto rw

Closes #318
Requested by @oleg-jukovec in tarantool/tt@61adda9.