Use a more pythonic string construction
Use a more pythonic string construction

Use interpolation rather than concatenation of literals and variables.

Change-Id: I1762534586751aa29174afcd67823468abcde123

noironetworks/neutron,bigswitch/neutron,chitr/neutron,mahak/neutron,openstack/neutron,bigswitch/neutron,dims/neutron,apporc/neutron,mahak/neutron,openstack/neutron,openstack/neutron,MaximNevrov/neutron,jumpojoy/neutron,klmitch/neutron,igor-toga/local-snat,yanheven/neutron,chitr/neutron,igor-toga/local-snat,wolverineav/neutron,mahak/neutron,cloudbase/neutron,eayunstack/neutron,huntxu/neutron,eayunstack/neutron,apporc/neutron,noironetworks/neutron,wolverineav/neutron,dims/neutron,cloudbase/neutron,sebrandon1/neutron,huntxu/neutron,klmitch/neutron,jumpojoy/neutron,MaximNevrov/neutron,sebrandon1/neutron,yanheven/neutron