CA-178380: Fix xlvhd reset on boot
CA-178380: Fix xlvhd reset on boot

From: Stefano Panella <Stefano.Panella@citrix.com>

In xlvhd case reset_leaf is now resizing to SR initial_allocation.

This could be improved in the future by using the vdi
initial_allocation which should already have a sensible value.

Signed-off-by: Stefano Panella <e1ed83fdabd8cb12bfc02b8141515b791627b7e3@citrix.com>
Reviewed-by: Jorge Martin <c3f1e05fcce351010b03bf05816137fb1dc5c7f2@citrix.com>

chandrikas/sm,pritha-srivastava/sm,germanop/sm,kostaslamda/sm,germanop/sm,chandrikas/sm,pritha-srivastava/sm,kostaslamda/sm,xapi-project/sm,kostaslamda/sm,xapi-project/sm,pritha-srivastava/sm,xapi-project/sm,chandrikas/sm,germanop/sm