param: Add API to load registry without share info

param: Add API to load registry without share info

As number of shares increases loading entire registry configuration along with
share information becomes very costly operation.
Since we may not require share information all time, we can optimise
this by using API just loading configuration without any share info.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=15780

Signed-off-by: Vinit Agnihotri <vagnihot@redhat.com>
Reviewed-by: John Mulligan <jmulligan@samba.org>
Reviewed-by: Guenther Deschner <gd@samba.org>