using apt module instead of command module to install python-apt

roles/kubernetes/preinstall/tasks/main.yml

@@ -61,16 +61,12 @@
     - "/opt/cni/bin"
   when: kube_network_plugin == "calico"
 
-- name: Update package management cache (APT)
-  apt: update_cache=yes
-  when: ansible_pkg_mgr == 'apt'
-
 - name: Update package management cache (YUM)
   yum: update_cache=yes name='*'
   when: ansible_pkg_mgr == 'yum'
 
-- name: Install python-apt for Debian distribs
-  command: apt-get install -y python-apt
+- name: Install latest version of python-apt for Debian distribs
+  apt: name=python-apt state=latest update_cache=yes cache_valid_time=3600
   when: ansible_os_family == "Debian"
   changed_when: False
 
@@ -78,7 +74,6 @@
   command: dnf install -y python-dnf yum
   when: ansible_distribution == "Fedora" and
         ansible_distribution_major_version > 21
-  changed_when: False
 
 - name: Install epel-release on RHEL
   command: rpm -ivh http://dl.fedoraproject.org/pub/epel/7/x86_64/e/epel-release-7-5.noarch.rpm