updated Debian package installation syntax for Ansible v2

roles/ceph-common/tasks/installs/install_on_debian.yml

@@ -1,11 +1,11 @@
 ---
 - name: install dependencies
   apt:
-    pkg: "{{ item }}"
+    name: "{{ item }}"
     state: present
     update_cache: yes
     cache_valid_time: 3600
-  with_items: debian_package_dependencies
+  with_items: "{{debian_package_dependencies}}"
 
 - name: configure ceph apt repository
   include: debian_ceph_repository.yml
@@ -13,10 +13,10 @@
 
 - name: install ceph
   apt:
-    pkg: "{{ item }}"
+    name: "{{ item }}"
     state: "{{ (upgrade_ceph_packages|bool) | ternary('latest','present') }}"
     default_release: "{{ ceph_stable_release_uca | default(ansible_distribution_release) }}{{ '-backports' if ceph_origin == 'distro' and ceph_use_distro_backports else ''}}"
-  with_items: debian_ceph_packages
+  with_items: "{{debian_ceph_packages}}"
 
 - name: install ceph-test
   apt: