Ensure that stack home is owned by stack

The role that sets up the user and its home folder must ensure that
the home folder is owned by stack as well.

Change-Id: I2e72d7b9d68a2a14f8a148ef82cbb3f569bd1cea
diff --git a/roles/setup-stack-user/tasks/main.yaml b/roles/setup-stack-user/tasks/main.yaml
index 8384515..0fc7c2d 100644
--- a/roles/setup-stack-user/tasks/main.yaml
+++ b/roles/setup-stack-user/tasks/main.yaml
@@ -21,10 +21,12 @@
     group: stack
   become: yes
 
-- name: Set stack user home directory permissions
+- name: Set stack user home directory permissions and ownership
   file:
     path: '{{ devstack_stack_home_dir }}'
     mode: 0755
+    owner: stack
+    group: stack
   become: yes
 
 - name: Copy 50_stack_sh file to /etc/sudoers.d
@@ -36,7 +38,7 @@
     group: root
   become: yes
 
-- name: Create new/.cache folder within BASE
+- name: Create .cache folder within BASE
   file:
     path: '{{ devstack_stack_home_dir }}/.cache'
     state: directory