fence_hpblade fails with "TypeError: log_expect() takes exactly 3 arguments (4 given)" on RHEL 7

Issue

• fence_hpblade fails with the following error:

# fence_hpblade -v -x -a blade.example.com -l my_user -p my_password --plug=1
2018-11-09 11:05:44,413 DEBUG: Sent: show enclosure info

Traceback (most recent call last):
  File "/usr/sbin/fence_hpblade", line 134, in <module>
    main()
  File "/usr/sbin/fence_hpblade", line 127, in main
    options["enc_type"] = get_enclosure_type(conn, options)
  File "/usr/sbin/fence_hpblade", line 19, in get_enclosure_type
    conn.log_expect(options, options["--command-prompt"], int(options["--shell-timeout"]))
TypeError: log_expect() takes exactly 3 arguments (4 given)