Fix scons failure due to pip ugrade
Fix scons failure due to pip ugrade

Change-Id: Id9fe0059c82ffa2b96358a095efd29bbfd5e6012
Closes-Bug: 1536541

sajuptpm/contrail-controller,nischalsheth/contrail-controller,codilime/contrail-controller,tcpcloud/contrail-controller,eonpatapon/contrail-controller,sajuptpm/contrail-controller,codilime/contrail-controller,nischalsheth/contrail-controller,rombie/contrail-controller,nischalsheth/contrail-controller,eonpatapon/contrail-controller,codilime/contrail-controller,nischalsheth/contrail-controller,eonpatapon/contrail-controller,tcpcloud/contrail-controller,eonpatapon/contrail-controller,sajuptpm/contrail-controller,nischalsheth/contrail-controller,codilime/contrail-controller,rombie/contrail-controller,nischalsheth/contrail-controller,sajuptpm/contrail-controller,rombie/contrail-controller,sajuptpm/contrail-controller,tcpcloud/contrail-controller,eonpatapon/contrail-controller,eonpatapon/contrail-controller,rombie/contrail-controller,nischalsheth/contrail-controller,tcpcloud/contrail-controller,tcpcloud/contrail-controller,sajuptpm/contrail-controller,rombie/contrail-controller,eonpatapon/contrail-controller,codilime/contrail-controller,codilime/contrail-controller,rombie/contrail-controller,nischalsheth/contrail-controller,rombie/contrail-controller,tcpcloud/contrail-controller