Commits on Dec 20, 2023

1. replicaset: soften name validation …

   During upgrade to Tarantool 3.0.0 there's a time, when instance name
   have not been set yet. If vshard strictly validates names on connection,
   it leads to the cluster unavailability by the time, when all names are
   configured.
   
   This commit softens the check and allows name to be nil, when instance
   UUID is specified in configuration, only UUID is validated in such case.
   
   In conclusion we have the following checks on connection:
   
       1. UUID is validated in the following cases:
           a. When `identification_mode` is `uuid_as_key`
           b. When `identification_mode` is `name_as_key` and replica.uuid
              is specified
   
       2. Instance name is validated only when `identification_mode` is
          `name_as_key` and can work in the following modes:
           a. Strict validation (nil instance name is not allowed), when
              replica.uuid is not specified.
           b. Soft validation (nil instance name is allowed), when
              replica.uuid is specified.
   
   Follow-up tarantool#426
   
   NO_DOC=internal

   

   Serpentian committed Dec 20, 2023
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