CP-12766: Allow VDI override for thin sr defaults
CP-12766: Allow VDI override for thin sr defaults

From: Siddharth Vinothkumar <dfecda33490a98eb9acd390f514dd6b90713a050@citrix.com>
Date: Mon, 20 Jul 2015 19:31:23 +0100

Signed-off-by: Siddharth Vinothkumar <dfecda33490a98eb9acd390f514dd6b90713a050@citrix.com>
Signed-off-by: chengz <f157832f2f1df5a7c962d3abb092f6b1ea020882@citrix.com>
Signed-off-by: Si Beaumont <a0992b7f1f450b4c7716d34b81a2d6f0877ae11a@citrix.com>
Reviewed-by: Germano Percossi <1811ef1c36bab1195f69031187febf2a003dfc12@citrix.com>

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