The value of sapTlsDefMsapGroupIf specifies the name of
the group interface where Managed SAP's are created
when there is no Radius server available, or the Radius
server does not specify the group interface.
The value of sapTlsDefMsapGroupIf is only relevant for
a SAP with a sapSubType value of 'capture'.
While the value of sapTlsDefMsapGroupIf is the empty
string, no Managed SAP's are created when there is no
Radius server-specified group interface available.
For a SAP with a sapSubType value other than 'capture',
zero is the only value allowed.