Several changes to the check-config mode for Cisco IOS systems.
* Modified config check to only take the running-config-changed and the startup-config-changed
values into account. (The running-config-saved value is not usefull for this check)
* Added a time-margin after a reload (5 minutes seems reasonable) wherein the running-config-changed time
may be ahead of the startup-config-changed time. After a reload, the device may report a
running-config-changed time of up to 5 minutes later than the startup-config-changed time when
in fact nothing has changed.
* Fixed mitigation; this parameter had no effect.