Remove container setup tasks from VM setup playbook

Looking at builds that will involve different, or multiple, containers.
Probably makes more sense to set up and tear down containers after VM is
built.

roles/gitian/tasks/main.yml

@@ -175,20 +175,6 @@
     mode: "0755"
   tags: script
 
-- name: Check for presence of Gitian LXC image.
-  stat:
-    path: "/home/{{ gitian_user }}/gitian-builder/base-jessie-amd64"
-  register: gitian_lxc_image
-
-- name: Set up the Gitian LXC image.
-  shell: "source ~/.profile && /home/{{ gitian_user }}/gitian-builder/bin/make-base-vm --lxc --arch amd64 --distro debian --suite jessie"
-  when: gitian_lxc_image.stat.exists == false
-  become: yes
-  become_user: "{{ gitian_user }}"
-  args:
-    chdir: "/home/{{ gitian_user }}/gitian-builder"
-    executable: /bin/bash
-
 - name: Clean the apt cache to free up space.
   apt:
     autoclean: yes