Windows: RefCounts, Asserts, and Trace Logging

Windows: RefCounts, Asserts, and Trace Logging

Rename DirectoryCB.OpenReferenceCount to DirOpenReferenceCount
to distinguish it from the FCB.OpenReferenceCount.  This makes
it easier to search for instances within an editor or debugger.

Ensure that all InterlockedIncrement and InterlockedDecrement
calls on a reference count field assign their value to a local
'lCount' variable.  Ensure that 'lCount' is used within any
trace log messages and conditionals.

Add ASSERT( lCount >= 0) after all reference count decrements
in order to catch underflows.

Change conditionals from (RefCount == 0) to (RefCount <= 0) so
that object destruction can occur when there has been an underflow.
This is important in release builds for which ASSERT() is a no-op.

Change-Id: I1d10076464c68745ede117eef2f728f70a0003c1
Reviewed-on: http://gerrit.openafs.org/8522
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
Tested-by: Jeffrey Altman <jaltman@your-file-system.com>