Fix sed replacement command in Ubuntu's install_docker
Fix sed replacement command in Ubuntu's install_docker

The 's' command wasn't closed properly. This was fixed in kolla repo
before it was decided that the dev env should go in kolla-ansible.

Change-Id: Ia1434ebb276f0fc76bf88fe386b8e9527133ce4d

dardelean/kolla-ansible,dardelean/kolla-ansible,dardelean/kolla-ansible