librpc/wsp: adjust the wsp property api to additionally use a csv file

librpc/wsp: adjust the wsp property api to additionally use a csv file

We have definitions for a number of properties both from the WSP
spec document and from those used by wireshark. These properties
are built into samba (generated from csv files). This commit allows
extra properties to be added on the fly in a custom csv file, the
format of the csv file is the same as that used in the build. This
allows us to add some 'unknown' properties on the fly, although we
would hope that information regarding these properties would be
incorporated into the build in due course.

Signed-off-by: Noel Power <noel.power@suse.com>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>