Removed simplejson from pip-requires.
Removed simplejson from pip-requires.

 * Addresses bug 921295

Change-Id: Ied6015b4115a60778dffc18c18e8907d87a7c83d

gaolichuang/neutron-fwaas,FedericoRessi/networking-odl,mestery/x-stackforge-odl,schoksey/networking-odl,openstack/networking-odl,schoksey/networking-odl,gandelman-a/neutron-lbaas,dougwig/x-neutron-lbaas,dougwig/x-neutron-fwaas,CiscoSystems/networking-odl,flavio-fernandes/networking-odl,CiscoSystems/networking-odl,gotostack/neutron-lbaas,FedericoRessi/networking-odl,openstack/neutron-fwaas,citrix-openstack-build/neutron-fwaas,gandelman-a/neutron-lbaas,gaolichuang/neutron-fwaas,gotostack/neutron-lbaas,openstack/neutron-vpnaas,citrix-openstack-build/neutron-lbaas,flavio-fernandes/networking-odl,openstack/networking-odl,citrix-openstack-build/neutron-vpnaas,gandelman-a/neutron-lbaas,dougwig/x-neutron-vpnaas,openstack/networking-odl,openstack/neutron-vpnaas,openstack/neutron-fwaas,gotostack/neutron-lbaas