Add method to show err-disable cause on Cisco (#248)
Method i_err_disable_cause implemented on CiscoPortSecurity.pm. Returns sparse data: ifIndex -> textual err-disable cause, for interfaces that are err-disabled.
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Method i_err_disable_cause implemented on CiscoPortSecurity.pm. Returns sparse data: ifIndex -> textual err-disable cause, for interfaces that are err-disabled.