Remove explicit distribute depend.
Remove explicit distribute depend.

Causes issues with the recent re-merge with setuptools. Advice from
upstream is to stop doing explicit depends.

Change-Id: Idb465068d25433582b8579a3ea96293f23368708

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