Use sudo for role testing

There are 2 ways to realize the privilege escalation
needed for the gate jobs.

1) Editing the playbooks (and hope to not forget to
write the sudo/become lines for every role)
2) Editing the inventory and set the variable there.

I'm taking the second approach with the minimum set
of variables (become_method is sudo by default and
become_user is root by default).

Change-Id: I066ac778f7bf3d3f569791e30067bcab4e8eef6b
Signed-off-by: Kevin Carter <kevin.carter@rackspace.com>

tests/ansible.cfg

@@ -1,3 +1,3 @@
 [defaults]
 roles_path = ../../
-
+remote_tmp = ../.ansible/tmp/

tests/inventory

@@ -1,2 +1,2 @@
 [all]
-localhost ansible_connection=local
+localhost ansible_connection=local ansible_become=True

tests/test.yml

@@ -16,6 +16,18 @@
 - name: Playbook for role testing
   hosts: localhost
   connection: local
+  pre_tasks:
+    - name: Ensure root ssh key
+      user:
+        name: "{{ ansible_env.USER | default('root') }}"
+        generate_ssh_key: "yes"
+        ssh_key_bits: 2048
+        ssh_key_file: ".ssh/id_rsa"
+    - name: get the calling users key
+      command: cat ~/.ssh/id_rsa.pub
+      register: key_get
+    - set_fact:
+        lxc_container_ssh_key: key_get.stdout
   roles:
     - role: "{{ rolename | basename }}"
       lxc_net_bridge: lxcbr0