The value of sapTlsDhcpUserDb specifies the local user database
to use for DHCP based authentication.
If no authentication with the local user database is required, the
value of this object must be set to the empty string.
The value of sapTlsDhcpUserDb is only valid for a SAP
with a sapSubType value of 'capture'. If the value is set
to a non-empty string for a SAP with a sapSubType value
other than 'capture', an 'inconsistentValue' error will
be returned.