This table defines the group of firewall rules applied to
individual interfaces. Rules for this group will be
applied in the etsysFWGroupPolicyTable.
The implementation may choose to allow modifications to this
table only under certain SNMP contexts. The
etsysFWIntfToGroupStorageType for a given SNMP context may be
readOnly, meaning the row cannot be modified or deleted. In
another SNMP context, the etsysFWIntfToGroupStorageType value
could allow the row to be modified or deleted.