s3-rpcclient: add deldriverex flags argument

s3-rpcclient: add deldriverex flags argument

The spoolss DeletePrinterDriverEx command offers three flags for
controlling how associated files and other versions of the driver are
effected: DPD_DELETE_UNUSED_FILES (1), DPD_DELETE_SPECIFIC_VERSION (2)
and DPD_DELETE_ALL_FILES (4).

This commit adds an optional numeric flags argument to the rpcclient
deldriverex command.

Signed-off-by: David Disseldorp <ddiss@samba.org>
Signed-off-by: Andreas Schneider <asn@samba.org>
Autobuild-User: David Disseldorp <ddiss@samba.org>
Autobuild-Date: Wed Jan 11 14:39:35 CET 2012 on sn-devel-104