roles/common: Use a fact for base packages on Debian

This is safer and ends up being faster because all packages get in-
stalled in one apt transaction.

roles/common/tasks/packages_Debian.yml

@@ -4,9 +4,9 @@
   - name: Configure apt mirror
     template: src=sources.list.j2 dest=/etc/apt/sources.list owner=root group=root mode=0644
 
-  - name: Install base packages
-    apt: name={{ item }} update_cache=yes
-    loop:
+  - name: Set fact for base packages
+    set_fact:
+      base_packages:
         - git
         - tmux
         - iotop
@@ -16,13 +16,16 @@
         - safe-rm
         - debian-goodies
         - mosh
-      - python-pycurl # for ansible's apt_repository
+        - python3-pycurl # for ansible's apt_repository
         - lzop
         - vim
         - lrzip
         - unzip
         - apt-transport-https # for https support in apt
 
+  - name: Install base packages
+    apt: name={{ base_packages }} update_cache=yes
+
   - name: Configure cron-apt
     import_tasks: cron-apt.yml
     tags: cron-apt