CA-106886: Don't update vhd-blocks during SR.scan
CA-106886: Don't update vhd-blocks during SR.scan

Don't bother updating the vhd-blocks in the XAPI database as this is
owned by the GC and there's no synchronisation for this.

Signed-off-by: Thanos Makatos <thanos.makatos@citrix.com>
Reviewed-by: Vineeth Thampi Raveendran <vineeth.thampi@citrix.com>

GitHub: closes #37 on xapi-project/sm

kostaslamda/sm,geosharath/sm,djs55/sm,xapi-project/sm,chandrikas/sm,siddharthv/sm,germanop/sm,malcolmcrossley/sm,xapi-project/sm,BobBall/sm,geosharath/sm,siddharthv/sm,pritha-srivastava/sm,robertbreker/sm,robertbreker/sm,malcolmcrossley/sm,chandrikas/sm,kostaslamda/sm,pritha-srivastava/sm,pritha-srivastava/sm,geosharath/sm,martinjorge/sm,BobBall/sm,xapi-project/sm,chandrikas/sm,BobBall/sm,martinjorge/sm,djs55/sm,martinjorge/sm,robertbreker/sm,germanop/sm,djs55/sm,malcolmcrossley/sm,kostaslamda/sm,siddharthv/sm,germanop/sm