Alias type provide sort function so it is better to use it
everywhere where list of public keys is presented.
Signed-off-by: Alex Vanin <alexey@nspcc.ru>
Now alphabet contracts use signature collection to make
a vote. All inner ring nodes votes for some list of validators
the same way as they vote fore new epoch or new container.
As soon as list is accepted by alphabet contracts, each of them
votes for one candidate from the list.
Signed-off-by: Alex Vanin <alexey@nspcc.ru>
