CP-12405: Trim implementation using 'blkdiscard'
CP-12405: Trim implementation using 'blkdiscard'

From: Pritha Srivastava <0115359e9d76c22e1dc0fa9fba44c842920cd2c7@citrix.com>

Signed-off-by: Pritha Srivastava <0115359e9d76c22e1dc0fa9fba44c842920cd2c7@citrix.com>
Reviewed-by: Chandrika Srinivasan <51ae5eeda27fe08017d2d63c87755f0707891830@citrix.com>

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