Impossible to have staking/validator duplicated operator address address

[dzmitryhil]

Bug description

It is possible to have two validators one Jailed and one Active with different consensus addresses but the same operator address. Becasue the DB table validator_info contains the unique modifier for the operator_address .

Steps to reproduce

• Create a validator with pub key 1, operator address 1, and self delegate address 1
• Stop the validator and let it be jailed
• Undelegate from the validator
• Run BDJuno and let it sync the data (and keep it running)
• Create a validator with pub key 2, operator address 1, and self delegate address 1
• Check BDJuno logic the violates unique constraint "validator_info_operator_address_key" error will there
• Try to update validators state using the cli bdjuno parse staking validators --home .bdjuno, the same error will error out.

Expected behavior

The BDJuno should save both validators.