New field in JOIN request: IPROTO_SERVER_VERSION

[TarantoolBot]

Product: Tarantool
Since: 2.10.0-beta1
Root document: https://www.tarantool.io/en/doc/latest/dev_guide/internals/box_protocol/#box-protocol-join
SME: @ sergepetrenko

Details

JOIN request now comes with a new field: replica's version.
The field uses IPROTO_SERVER_VERSION key.
Requested by @sergepetrenko in tarantool/tarantool@528f543.