The name of the policy group containing the global
system policy. The value of etsysFWSystemPolicyGroupName
should be used as an index into the etsysFWGroupPolicyTable to
determine the list of rules that MUST be applied to the system.
A zero length string indicates no system wide policy exists,
and the default policy of 'allow' should be executed until one
is imposed by either this object or by the interface processing
the packet.
Since policy group names are unique, the
etsysFWSystemPolicyGroupName MUST NOT be equal to any
etsysFWIntfToGroupName objects.