Remove cipher_list_by_id.

When parsing a cipher string, a cipher list is created, before being
duplicated and sorted - the second copy being stored as cipher_list_by_id.
This is done only so that a client can ensure that the cipher selected by
a server is in the cipher list. This is pretty pointless given that most
clients are short-lived and that we already had to iterate over the cipher
list in order to build the client hello. Additionally, any update to the
cipher list requires that cipher_list_by_id also be updated and kept in
sync.

Remove all of this and replace it with a simple linear scan - the overhead
of duplicating and sorting the cipher list likely exceeds that of a simple
linear scan over the cipher list (64 maximum, more typically ~9 or so).

ok beck@ tb@

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