[PATCH v3 resend 1/4] server: Allow get_volume_info to issue IRP_MJ_QUERY_VOLUME_INFORMATION.

[Erich E. Hoover]

Per AJ's request for splitting, this patch allows the get_volume_info
request to issue an IRP to request the volume information from the
mountmgr.  Sorry it's taken me awhile to get to this :/

Note that patch 1 and 2 can be applied in opposite order, if desired.

Best,
Erich2