Function: optOutValidator()

This allows validator to opt out.

Branches and code coverage

Intended branches

• Assure that there is at least one validator left. Currently not performed.

  Test coverage

• Pop the validator from the validatorAddresses array. Performed in removeValidatorRewardList.

  Test coverage

• Assure that the validator has not already opted out.

  Test coverage

• Assure that the validator has not already begun the opt-out process.

  Test coverage

• Set the optOutTime of the validator to the current time plus one day.

  Test coverage

• Reset the currentStake of the validator to zero.

  Test coverage

• Transfer the validator's stake back to them.

  Test coverage

• Remove the validator from the validatorRewardList.

  Test coverage

Negative behavior

• Should not allow anyone other than a validator to call this function.

  Negative test