DCD-224: Rename linux-common to linux_common for consistency.

roles/linux_common/tasks/debian.yml

@@ -0,0 +1 @@
+---

roles/linux_common/tasks/main.yml

@@ -0,0 +1,12 @@
+---
+
+# 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"
+
+- name: Install common support packags
+  package:
+    name:
+      - jq
+      - curl

roles/linux_common/tasks/redhat.yml

@@ -0,0 +1,6 @@
+---
+
+- name: Install Redhat family support packages
+  yum:
+    name:
+      - shadow-utils