Duplicated owner's fields in EternalProxy

[rstormsf]

there are 2 methods:

    function upgradeabilityOwner() public view returns (address) {
        return _upgradeabilityOwner;
    }

and

    function proxyOwner() public view returns (address) {
        return upgradeabilityOwner();
    }

I don't see any good reason to have those 2