config: supported vshard version

[TarantoolBot]

Related dev. issue(s): tarantool/tarantool#8862

Product: Tarantool, vshard
Since: 3.0 (vshard 0.1.25)
Root document:

• https://www.tarantool.io/en/doc/latest/how-to/vshard_quick/
• https://www.tarantool.io/en/doc/latest/book/admin/vshard_admin/

SME: @ ImeevMA

Details

The vshard version supported by the config module cannot be less than
0.1.25. Note, that vshard will only be loaded if any of instances have
sharding storage role or sharding router role.
Requested by @ImeevMA in tarantool/tarantool@1fe7186.