Windows: No RO volume test SetFilePosInfo

Setting the file position information on a file is not a data
changing operation.  Do not perform a readonly volume check.

Reviewed-on: http://gerrit.openafs.org/11066
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
(cherry picked from commit fe706913190acf176292e8c68d0a0adfc015f487)

Change-Id: Ifd615239ad5650c3ae72b20b5fae1fbc0564e069
Reviewed-on: http://gerrit.openafs.org/11077
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
Windows: Do not defer Synchronous operations

There is nothing to be gained by posting a synchronous write.
Let it hang out in CcCopyWrite until there is enough memory
unless the write became synchronous after a deferral in which
case it can be deferred again.

Introduce bWait variable which is set to the result of
IoIsSynchronousWrite( Irp).

This change is being introduced after further analysis of the
FastFat example.

Reviewed-on: http://gerrit.openafs.org/11067
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Rod Widdowson <rdw@steadingsoftware.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
(cherry picked from commit 41b865212b7576c0840bfc0f7c34c900e46f41c8)

Change-Id: Ia10dd1647a5baec39d396dfda1b8dd0c3f161ef3
Reviewed-on: http://gerrit.openafs.org/11078
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>