Fencing fails with a delay attribute that includes "s" (or any non-integer value)

Issue

• After implementing a delay on one or more of our stonith resources, we are seeing fence failures.
• In the logs, the failures look like the following:

 hostname stonith-ng[33888]:  warning: fence_ipmilan[50215] stderr: [ Traceback (most recent call last): ]
 hostname stonith-ng[33888]:  warning: fence_ipmilan[50215] stderr: [   File "/usr/sbin/fence_ipmilan", line 199, in <module> ]
 hostname stonith-ng[33888]:  warning: fence_ipmilan[50215] stderr: [     main() ]
 hostname stonith-ng[33888]:  warning: fence_ipmilan[50215] stderr: [   File "/usr/sbin/fence_ipmilan", line 182, in main ]
 hostname stonith-ng[33888]:  warning: fence_ipmilan[50215] stderr: [     run_delay(options) ]
 hostname stonith-ng[33888]:  warning: fence_ipmilan[50215] stderr: [   File "/usr/share/fence/fencing.py", line 971, in run_delay ]
 hostname stonith-ng[33888]:  warning: fence_ipmilan[50215] stderr: [     time.sleep(int(options["--delay"])) ]
 hostname stonith-ng[33888]:  warning: fence_ipmilan[50215] stderr: [ ValueError: invalid literal for int() with base 10: '10s' ]