Windows: Move VolumeWorkerContext to NonPaged pool

The VolumeWorkerContext contains a KEVENT which must be allocated
from the NonPaged pool.  Move it to the AFSNonPagedVolumeCB struct.

Reviewed-on: http://gerrit.openafs.org/8992
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
Tested-by: Jeffrey Altman <jaltman@your-file-system.com>
(cherry picked from commit 34f4427a978a485d83b1faa57fd786e47b8dddf5)

Change-Id: Ic5711743ae4fa725913f775cbd4ec9d3506e8c53
Reviewed-on: http://gerrit.openafs.org/9031
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
Windows: Allocated VolumeCB from PagedPool

Only the non-paged portion of the VolumeCB should be allocated
from the non-paged pool.  Allocate the VolumeCB itself from the
paged pool.

Reviewed-on: http://gerrit.openafs.org/8957
Reviewed-by: Rod Widdowson <rdw@steadingsoftware.com>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
Tested-by: Jeffrey Altman <jaltman@your-file-system.com>
(cherry picked from commit 8d4757284a08d5e7123fab696c5da64faa4e6fb7)

Change-Id: Ib3a2b4a0a46879281a0e8c4934dc44d08acdc62b
Reviewed-on: http://gerrit.openafs.org/9032
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>