Update to the latest stevedore
Update to the latest stevedore

Use a version of stevedore that does not try to
install distribute.

The requirements change is in https://review.openstack.org/#/c/32738/

Change-Id: If39d886cb68044871617600650ef8546635143bc

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