Remove py33 tox target
Remove py33 tox target

py33 gating is disabled now in favor of py34.

Change-Id: Ic6574cf73f7a2f9c1d9688fd00e0fee8f95705bd

danielmellado/stackalytics,dliu2015/stackalytics_zanata,stackforge/stackalytics,nihilifer/stackalytics,danielmellado/stackalytics,mohitsethi/stackalytics,mhharsh/stackalytics,stackforge/stackalytics,Code-Fly/stackalytics,Solinea/stackalytics,nihilifer/stackalytics,0xf2/stackalytics,mohitsethi/stackalytics,AlexanderYAPPO/stackalytics,0xf2/stackalytics,mhharsh/stackalytics,dliu2015/stackalytics_zanata,mhharsh/stackalytics,openstack/stackalytics,AlexanderYAPPO/stackalytics,openstack/stackalytics,mohitsethi/stackalytics,Solinea/stackalytics,0xf2/stackalytics,AlexanderYAPPO/stackalytics,dliu2015/stackalytics_zanata,Mirantis/stackalytics,0xf2/stackalytics,danielmellado/stackalytics,openstack/stackalytics,openstack/stackalytics,Mirantis/stackalytics,Code-Fly/stackalytics,Solinea/stackalytics,nihilifer/stackalytics,Code-Fly/stackalytics,Mirantis/stackalytics,stackforge/stackalytics