CP-7292: remove the dependency on simplejson
CP-7292: remove the dependency on simplejson

The extra dependency on simplejson makes pylint to complain, because
the 3rd party module is not available in our building environment.

Replacing this single instance with python's standard json lib, we
can achieve equally good result for our simple object.

Signed-off-by: Zheng Li <fff69bf00b8ec5b6098a1768eaaaa75f40b8795d@eu.citrix.com>
Reviewed-by: Chandrika Srinivasan <51ae5eeda27fe08017d2d63c87755f0707891830@citrix.com>

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