Windows: clear ASYNCSTORING flag in scache recycle

If the scache has been recycled the ASYNCSTORING flag cannot
be accurrate.  Clear it.

Reviewed-on: http://gerrit.openafs.org/8970
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 5bedc5e03a21409b7d2426387584267e33073457)

Change-Id: I97bcb95b3b3a10d0449cb76918b2ef6a51e8ceaf
Reviewed-on: http://gerrit.openafs.org/9045
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
Windows: AFSCleanupFile always flush on last handle

Do not rely on a count of dirty extents to determine if the
service should flush a file during a cleanup operation.  Simply
because there are no dirty extents held by the redirector does
not imply that the service has no dirty buffers for the file.

Reviewed-on: http://gerrit.openafs.org/8971
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 8ae06c2ea48651ebd90635ffcc68bbccfeb908c8)

Change-Id: I79103db4c309b1cd4560aaeaad1d945548cdefd7
Reviewed-on: http://gerrit.openafs.org/9046
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>