[Bug 1750633] Re: signer and verifier have been deprecated

[Robert Mader]

Here's the link to the upstream fix:
https://github.com/paramiko/paramiko/pull/979/commits/fdc09c9f93fd189a6398d5b350a3c91011d9b4cb

I'd like to kindly request a backport (actually simply applying) it.
It's a fairly trivial and I just tested it on my server (18.04) without issues.

** Also affects: duplicity
   Importance: Undecided
       Status: New

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Title:
  signer and verifier have been deprecated

Status in Cursive:
  New
Status in Duplicity:
  New
Status in paramiko package in Ubuntu:
  Confirmed

Bug description:
  The cryptography library has deprecated the use of signer and verifier
  as of version 2.0 (see
  https://cryptography.io/en/latest/changelog/#v2-0 for changelog).

  The cursive library uses signer and verifier, and should be updated to
  use sign and verify instead.

  The following is the deprecation warning:

  /opt/stack/cursive/cursive/signature_utils.py:139: DeprecationWarning:
  signer and verifier have been deprecated. Please use sign and verify
  instead.

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