Pass package list as a list

This patch passes the list of packages to install as a list
rather then using the slower with_items.

Change-Id: Id8f356fbf92101c4f21e16ac28893deb26f2b0b3

tests/roles/bootstrap-host/tasks/install_packages.yml

@@ -92,17 +92,15 @@
 
 - name: Remove known problem packages
   package:
-    name: "{{ item }}"
+    name: "{{ packages_remove }}"
     state: absent
-  with_items: "{{ packages_remove }}"
   tags:
     - remove-packages
 
 - name: Install packages
   package:
-    name: "{{ item }}"
+    name: "{{ packages_install }}"
     state: present
-  with_items: "{{ packages_install }}"
   tags:
     - install-packages