remove duplicated cirros-0.3.4 image
remove duplicated cirros-0.3.4 image

Change-Id: I022d406e1981d371956ca7fc589c5831c6b599b5

meniy/Vagrant,unibg-seclab/devstack-vagrant,unibg-seclab/devstack-vagrant,AlessandroCopler/TestVagrant,AlessandroCopler/TestVagrant,meniy/Vagrant,unibg-seclab/devstack-vagrant,meniy/Vagrant