Python3: cast the result of zip() to list
Python3: cast the result of zip() to list

The result of get_sorts was a 'zip object' in Python 3, and it was later used
as a list, which fails. Just cast the result to a list to fix this issue.

Change-Id: I12017f79cad92b1da4fe5f9939b38436db7219eb
Blueprint: neutron-python3

yanheven/neutron,mahak/neutron,wolverineav/neutron,SamYaple/neutron,mmnelemane/neutron,javaos74/neutron,mattt416/neutron,klmitch/neutron,glove747/liberty-neutron,glove747/liberty-neutron,sasukeh/neutron,adelina-t/neutron,cloudbase/neutron,suneeth51/neutron,takeshineshiro/neutron,eayunstack/neutron,igor-toga/local-snat,jacknjzhou/neutron,skyddv/neutron,swdream/neutron,sebrandon1/neutron,eonpatapon/neutron,eayunstack/neutron,jumpojoy/neutron,openstack/neutron,adelina-t/neutron,cloudbase/neutron,igor-toga/local-snat,bigswitch/neutron,barnsnake351/neutron,dhanunjaya/neutron,mahak/neutron,SamYaple/neutron,chitr/neutron,barnsnake351/neutron,jacknjzhou/neutron,vivekanand1101/neutron,mattt416/neutron,skyddv/neutron,shahbazn/neutron,cisco-openstack/neutron,jumpojoy/neutron,mmnelemane/neutron,openstack/neutron,noironetworks/neutron,sebrandon1/neutron,JianyuWang/neutron,silenci/neutron,paninetworks/neutron,dims/neutron,apporc/neutron,huntxu/neutron,asgard-lab/neutron,vivekanand1101/neutron,dhanunjaya/neutron,neoareslinux/neutron,watonyweng/neutron,paninetworks/neutron,JianyuWang/neutron,dims/neutron,wenhuizhang/neutron,yanheven/neutron,MaximNevrov/neutron,watonyweng/neutron,openstack/neutron,javaos74/neutron,huntxu/neutron,eonpatapon/neutron,takeshineshiro/neutron,swdream/neutron,mahak/neutron,asgard-lab/neutron,apporc/neutron,MaximNevrov/neutron,neoareslinux/neutron,bigswitch/neutron,cisco-openstack/neutron,sasukeh/neutron,noironetworks/neutron,chitr/neutron,klmitch/neutron,wolverineav/neutron,wenhuizhang/neutron,silenci/neutron,suneeth51/neutron,shahbazn/neutron