Description of problem:
Upgrade from python2-crypto-2.6.1-10.fc24.x86_64 to python2-crypto-2.6.1-13.fc24.x86_64 causes duplicity SSH backend to fail.

Running "dnf downgrade python2-crypto" reverts to python2-crypto-2.6.1-10.fc24.x86_64 and backups succeed.

Version-Release number of selected component (if applicable):
python2-crypto-2.6.1-13.fc24.x86_64

How reproducible:
Easily.

Steps to Reproduce:
1. "dnf upgrade" on F24 causes update of python2-crypto to python2-crypto-2.6.1-13.fc24.x86_64
2. Use duplicity to backup to SSH destination.
3. See above failure.

Actual results:
ssh: Connected (version 2.0, client OpenSSH_7.2)
ssh: Unknown exception: CTR mode needs counter parameter, not IV
ssh: Traceback (most recent call last):
ssh:   File "/usr/lib/python2.7/site-packages/paramiko/transport.py", line 1744, in run
ssh:     self.kex_engine.parse_next(ptype, m)
ssh:   File "/usr/lib/python2.7/site-packages/paramiko/kex_group1.py", line 75, in parse_next
ssh:     return self._parse_kexdh_reply(m)
ssh:   File "/usr/lib/python2.7/site-packages/paramiko/kex_group1.py", line 112, in _parse_kexdh_reply
ssh:     self.transport._activate_outbound()
ssh:   File "/usr/lib/python2.7/site-packages/paramiko/transport.py", line 2074, in _activate_outbound
ssh:     engine = self._get_cipher(self.local_cipher, key_out, IV_out)
ssh:   File "/usr/lib/python2.7/site-packages/paramiko/transport.py", line 1649, in _get_cipher
ssh:     return self._cipher_info[name]['class'].new(key, self._cipher_info[name]['mode'], iv, counter)
ssh:   File "/usr/lib64/python2.7/site-packages/Crypto/Cipher/AES.py", line 95, in new
ssh:     return AESCipher(key, *args, **kwargs)
ssh:   File "/usr/lib64/python2.7/site-packages/Crypto/Cipher/AES.py", line 59, in __init__
ssh:     blockalgo.BlockAlgo.__init__(self, _AES, key, *args, **kwargs)
ssh:   File "/usr/lib64/python2.7/site-packages/Crypto/Cipher/blockalgo.py", line 141, in __init__
ssh:     self._cipher = factory.new(key, *args, **kwargs)
ssh: ValueError: CTR mode needs counter parameter, not IV
ssh: 
Using temporary directory /tmp/duplicity-S9liSL-tempdir
Backend error detail: Traceback (most recent call last):
  File "/usr/bin/duplicity", line 1546, in <module>
    with_tempdir(main)
  File "/usr/bin/duplicity", line 1540, in with_tempdir
    fn()
  File "/usr/bin/duplicity", line 1375, in main
    action = commandline.ProcessCommandLine(sys.argv[1:])
  File "/usr/lib64/python2.7/site-packages/duplicity/commandline.py", line 1126, in ProcessCommandLine
    backup, local_pathname = set_backend(args[0], args[1])
  File "/usr/lib64/python2.7/site-packages/duplicity/commandline.py", line 1015, in set_backend
    globals.backend = backend.get_backend(bend)
  File "/usr/lib64/python2.7/site-packages/duplicity/backend.py", line 223, in get_backend
    obj = get_backend_object(url_string)
  File "/usr/lib64/python2.7/site-packages/duplicity/backend.py", line 209, in get_backend_object
    return factory(pu)
  File "/usr/lib64/python2.7/site-packages/duplicity/backends/ssh_paramiko_backend.py", line 235, in __init__
    self.config['port'], e))
BackendException: ssh connection to root.0.1:22 failed: CTR mode needs counter parameter, not IV


Expected results:
Backups to succeed.

Additional info:
Seems related to: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=850025 and https://github.com/dlitz/pycrypto/issues/149