Log Message:
Upgrade py-paramiko from 1.15.3 to 1.18.2.

Pkgsrc changes:
Adapt PLIST.

Upstream changes:

1.18.2 2017-02-20
  [Bug] #895: Fix a bug in server-mode concerning multiple interactive
     auth steps (which were incorrectly responded to). Thanks to Dennis
     Kaarsemaker for catch & patch.
  [Bug] #713: (via #714 and #889) Don't pass initialization vectors
     to PyCrypto when dealing with counter-mode ciphers; newer PyCrypto
     versions throw an exception otherwise (older ones simply ignored
     this parameter altogether). Thanks to @jmh045000 for report &
     patches.
  [Bug] #44: (via #891) SSHClient now gives its internal Transport
     a handle on itself, preventing garbage collection of the client
     until the session is closed. Without this, some code which returns
     stream or transport objects without the client that generated
     them, would result in premature session closure when the client
     was GCd. Credit: @w31rd0 for original report, Omer Anson for the
     patch.
  [Bug] #862: (via #863) Avoid test suite exceptions on platforms
    lacking errno.ETIME (which seems to be some FreeBSD and some
    Windows environments.) Thanks to Sofian Brabez.
  [Bug] #853: Tweak how RSAKey.__str__ behaves so it doesn't
    cause TypeError under Python 3. Thanks to Francisco Couzo for
    the report.
  [Support] #866: (also #838) Remove an old test-related file we
    don't support, and add PyPy to Travis-CI config. Thanks to
    Pierce Lopez for the final patch and Pedro Rodrigues for an
    earlier edition.

1.18.1 2016-12-12
  [Bug] #859: (via #860) A tweak to the original patch implementing
    #398 was not fully applied, causing calls to invoke_shell to
    fail with AttributeError. This has been fixed. Patch credit:
    Kirk Byers.

1.18.0 2016-12-09
  [Feature] #398: Add an environment dict argument to
    Client.exec_command (plus the lower level Channel.update_environment
    and Channel.set_environment_variable methods) which implements
    the env SSH message type. This means the remote shell environment
    can be set without the use of VARNAME=value shell tricks,
    provided the server's AcceptEnv lists the variables you need
    to set. Thanks to Philip Lorenz for the pull request.
  [Feature] #780: (also #779, and may help users affected by
    #520) Add an optional timeout parameter to Transport.start_client
    (and feed it the value of the configured connection timeout
    when used within SSHClient.) This helps prevent situations
    where network connectivity isn't timing out, but the remote
    server is otherwise unable to service the connection in a timely
    manner. Credit to @sanseihappa.
  [Support] #819: Document how lacking gmp headers at install
    time can cause a significant performance hit if you build
    PyCrypto from source. (Most system-distributed packages already
    have this enabled.)
  [Support] #854: Fix incorrect docstring/param-list for
    Transport.auth_gssapi_keyex so it matches the real signature.
    Caught by @Score_Under.
  [Support] #792: Minor updates to the README and demos; thanks to Alan Yee.
  [Support] #801: Skip a Unix-only test when on Windows; thanks to Gabi Davar.

For pre-1.18.0 changes, see
  http://www.paramiko.org/changelog.html