DEVEL15-windows-remove-scache-volp-20080312

DEVEL15-windows-remove-scache-volp-20080312

LICENSE MIT

The cm_scache structure has included a reference to the associated cm_volume_t,
volp.  By doing so the reference count on the cm_volume_t objects never hits
zero unless all of the cm_scache_t objects in that volume have been reused.
This prevents cm_volume object recycling.

This commit removes the hard reference and instead adds a function
cm_GetVolumeByFID which obtains a reference to the cm_volume that matches
the cm_scache fid value as needed.

A new "Volumes" registry value is added to permit explicit specification
of the number of volume objects to be allocated.

(cherry picked from commit f9cc51fb40f1797b72ba5b05d7d0249b9a3b2e27)