put conatiner name to array in cleanup-containers
put conatiner name to array in cleanup-containers

The brace in string variable will not be expanded in some case.
Put conatiner name into array.

Change-Id: I2fb16e7352bd579f207efce0fb9b2565a1e7236d
Closes-Bug: #1502467

mrangana/kolla,limamauricio/mykolla,intel-onp/kolla,negronjl/kolla,limamauricio/mykolla,rajalokan/kolla,mandre/kolla,stackforge/kolla,tonyli71/kolla,GalenMa/kolla,dardelean/kolla-ansible,coolsvap/kolla,rahulunair/kolla,mandre/kolla,dardelean/kolla-ansible,coolsvap/kolla,toby82/kolla,nihilifer/kolla,mrangana/kolla,rajalokan/kolla,dardelean/kolla-ansible,toby82/kolla,GalenMa/kolla,nihilifer/kolla,openstack/kolla,negronjl/kolla,toby82/kolla,limamauricio/mykolla,openstack/kolla,stackforge/kolla,mandre/kolla,negronjl/kolla,rahulunair/kolla,intel-onp/kolla,rajalokan/kolla,coolsvap/kolla,stackforge/kolla,tonyli71/kolla