The string defined by user to fill in the
node identifier in the verbose mode.
If the value of hpnicfDhcpRelay2IfOpt82CIDMode is NOT 'verbose',
or the value of hpnicfDhcpRelay2IfOpt82CIDNodeType is
NOT 'userDefine', it is set with a zero-length string
automatically.
Otherwise it must be set with a non-zero length string.
The SET operation of this object must be with the SET
operation of hpnicfDhcpRelay2IfOpt82CIDMode and
hpnicfDhcpRelay2IfOpt82CIDNodeType.