Use 1.4.1 of pip.
Use 1.4.1 of pip.

- This is where the option pip install --pre is.

Change-Id: I3f836a701f17a4fea888ec51da62e7137cf0e6db

olivierlemasle/devstack,Mahito/devstack,kplus/devstack-moonshot,promptworks/devstack,noironetworks/devstack,nawawi/openstack,mssumanth/devstack,Juniper/devstack,CloudServer/devstack,bljgaurav/openstack-test,jamielennox/devstack,JioCloud/devstack,pacinete/devstack,sc68cal/devstack,rushiagr/devstack,costingalan/devstack,affo/devstack,neerja28/Devstack_GlusterFS,Yuriy-Leonov/devstack,williamthegrey/devstack,parul24/devstack,eharney/devstack,Millnert/contrail-devstack,bq-xiao/devstack,avvocatodemarchis/devstack,mc2014/devstack,innodee/openstackk,nuxeh/devstack,NaokiMiyata/devstack,richliu/devstack,virtualopensystems/devstack,sc68cal/devstack,vsham20/devstack,flavio-fernandes/devstack,j4/devstack,dirkmueller/devstack,Mahito/devstack,wenhuizhang/devstack,yamt/devstack,ozamiatin/devstack,bq-xiao/devstack,flavio-fernandes/devstack,BSJAIN92/OpenStack,prithivm/branch01,neerja28/Devstack_GlusterFS,bigswitch/devstack,HPCHub/devstack,vishnugonela/devstack,pczerkas/devstack,thomasem/devstack,promptworks/devstack,dtroyer/devstack,tianweizhang/devstack,liuquansheng47/devstack,ozamiatin/devstack,andrewrothstein/devstack,nawawi/openstack,pombredanne/devstack,kplus/devstack-moonshot,openstack-dev/devstack,HPCHub/devstack,bswartz/devstack,upadhyay-prashant/devstack,rushiagr/devstack,atulpatil301/devstack,group-policy/devstack,andrewrothstein/devstack,LoHChina/devstack,herrsechs/devstack,j4/devstack,herrsechs/devstack,varunarya10/devstack,group-policy/devstack,mc2014/devstack,NaokiMiyata/devstack,olivierlemasle/devstack,pombredanne/devstack,wenhuizhang/devstack,pacinete/devstack,samgoon/devstack,vishnugonela/devstack,noironetworks/devstack,openstack-dev/devstack,dtroyer/devstack,samgoon/devstack,affo/devstack,prithivm/branch01,liuquansheng47/devstack,srics/devstack,sequenceiq/devstack,atulpatil301/devstack,avvocatodemarchis/devstack,bswartz/devstack,richliu/devstack,dirkmueller/devstack,upadhyay-prashant/devstack,eharney/devstack,CloudServer/devstack,mssumanth/devstack,varunarya10/devstack,LoHChina/devstack,eshnil2000/devstack,parul24/devstack,pczerkas/devstack,costingalan/devstack,thomasem/devstack,vsham20/devstack,mmasaki/devstack,TwinkleChawla/devstack,bigswitch/devstack,sequenceiq/devstack,BSJAIN92/OpenStack,TwinkleChawla/devstack,mmasaki/devstack,tianweizhang/devstack,bljgaurav/openstack-test,nuxeh/devstack