Merge topic branch t/crypt-cleanups into master

Merge topic branch t/crypt-cleanups into master

This bunch of mostry trivial changes can be merged early, before the
openssl code is converted to use the EVP API. The topic was cooking
in next for six months.

* refs/heads/t/crypt-cleanups:
  openssl: Assign bignums in canonical order.
  openssl: Unify naming of public key structures.
  openssl: Rename read_private_rsa_params() -> read_openssh_private_key().
  openssl: Rename read_rsa_bignums() -> read_public_key().
  openssl: Dedox crypt_init().
  server: Improve "loading pubkey" log message.
  gcrypt: Remove pointless state variable.
  client: Reduce line length.