roles/common: Synchronize Debian package task with Ubuntu

roles/common/tasks/packages_Debian.yml

@@ -12,7 +12,7 @@
         - iotop
         - htop
         - strace
-        - cron-apt #how does this work with systemd?
+        - cron-apt
         - safe-rm
         - debian-goodies
         - mosh
@@ -24,7 +24,7 @@
         - apt-transport-https # for https support in apt
 
   - name: Install base packages
-    apt: name={{ base_packages }} update_cache=yes
+    apt: name={{ base_packages }} state=present update_cache=yes cache_valid_time=3600
 
   - name: Configure cron-apt
     import_tasks: cron-apt.yml