Whenever the OPTIONAL<> construct is used for a member of a record,
we have to add an extra set of parenthsis in order to avoid bogus
"has no RAW decode method" error messages.
It seems the OPTIONAL inherits from Base_Type which will print
"which has no RAW decoding method" from its RAW_decode().
Change-Id: Idfaa11db0e2db4be144800b5bccc44d0515220d7
Their format is simply too complex to be used with the automatic RAW
encoder/decoder. Let's implement it by hand, using the automatic
coder whenever possible.
Harald Welte