This table contains a list of service definitions to be used
within the etsysFWPolicyRuleDefTable.
The implementation may choose to allow modifications to this
table only under certain SNMP contexts. The
etsysFWServiceStorageType for a given SNMP context may be
readOnly, meaning the row cannot be modified or deleted. In
another SNMP context, the etsysFWServiceStorageType value
could allow the row to be modified or deleted.