Update AIO script to support ubuntu-ports
Update AIO script to support ubuntu-ports

With the merge of [1], the way the bootstrap AIO script evaluates
the sources.list file for ubuntu was changed, which inadvertently
broke any distros using ubuntu-ports. This patch fixes the regex
to support ubuntu-ports repos.

[1] I7fab8f3c072e25fa8138c3e37d764b36d17526d6

Change-Id: I7ecd9dc130d194342e236bef42b08926f98940fd

os-cloud/os-ansible-deployment,yanyao/newton,cloudnull/os-ansible-deployment,yanyao/openstack-ansible,cfarquhar/openstack-ansible,BjoernT/openstack-ansible,BjoernT/os-ansible-deployment,bunchc/openstack-ansible,BjoernT/os-ansible-deployment,robb-romans/openstack-ansible,stackforge/os-ansible-deployment,yanyao/newton,robb-romans/openstack-ansible,stackforge/os-ansible-deployment,yanyao/openstack-ansible,Logan2211/openstack-ansible,openstack/openstack-ansible,os-cloud/os-ansible-deployment,weezer/openstack-ansible,Logan2211/openstack-ansible,BjoernT/openstack-ansible,weezer/openstack-ansible,bunchc/openstack-ansible,cloudnull/os-ansible-deployment,BjoernT/os-ansible-deployment,openstack/openstack-ansible,cfarquhar/openstack-ansible