feat(disk_balance): close origin replica and update replica dir

[foreverneverer]

• 1.support disk migration rpc request(RPC_REPLICA_DISK_MIGRATE) and check whether the request is valid. feat(disk_balance): support and validate disk migration rpc #660
• 2.add migrate_replica to support migrate origin data feat(disk_balance): add do_disk_migrate_replica to support migrate origin data #664
• 3.close origin replica and update replica dir

replica migration status

client(shell)--->replicaServer--->metaServer
      +                +              +
      |                |              |
      +-------start--->+ ->IDLE       |
      |                |    +         |
      |                |    v         |
      |                |  MOVING      |
      |                |    +         |
      |                |    v         |
      |                |  MOVED       |
      |                |    +         |
      |                |    v         |
      |                |  CLOSED      |
      |                |    +         |
      |                |    v         |
      |          +-----+ <-LEARN<-----+
      |          |     |
      |          v     |
      |     LearnSucess|
      |          +     |
      |          |     |
      +          +---->+

as above, this pr complete the work from MOVED to CLOSED

Config

[replication]
+ gc_disk_migration_tmp_replica_interval_seconds = 86400 #1day
+ gc_disk_migration_origin_replica_interval_seconds = 604800 #7day

Perf-counter

eon.replica_stub.replicas.tmp.replica.dir.count
eon.replica_stub.replicas.origin.replica.dir.count

Note

_useless_dir_reserve_seconds_command is deleted