vol: fix CreateFile params nt_unlink and nt_open

vol: fix CreateFile params nt_unlink and nt_open

nt_unlink: when opening a file handle to assign delete on close
status the caller must request DELETE permission.

nt_open: make sure that DELETE permission along with FILE_SHARE_DELETE
is requested if we wish to permit another CreateFile call in the future
to assign delete on close.

Reviewed-on: http://gerrit.openafs.org/3711
Reviewed-by: Andrew Deason <adeason@sinenomine.net>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Rod Widdowson <rdw@steadingsoftware.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
(cherry picked from commit 5fdc2679dc973fa45bf4b3bc7f21a527492868db)

Change-Id: I63855a65c5e209dc7b601e5b5b67ccb21bfb653c
Reviewed-on: http://gerrit.openafs.org/3856
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>