DCD-224: Move to more distro-specific package installation.

roles/linux_common/molecule/default/playbook.yml

@@ -2,4 +2,4 @@
 - name: Converge
   hosts: all
   roles:
-    - role: linux-common
+    - role: linux_common

roles/linux_common/tasks/main.yml

@@ -3,7 +3,7 @@
 # Note: Try and limit these to packages that are distro-specific, and
 # place commonly-named ones below.
 - name: Install distro-specific prerequisites
-  include: "{{ ansible_os_family|lower }}.yml"
+  include: "{{ ansible_distribution|lower }}.yml"
 
 - name: Install common support packags
   package: