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

roles/linux_common/molecule/default/molecule.yml

@@ -0,0 +1,20 @@
+---
+dependency:
+  name: galaxy
+driver:
+  name: docker
+lint:
+  name: yamllint
+platforms:
+  - name: amazon_linux2
+    image: amazonlinux:2
+  - name: ubuntu_lts
+    image: ubuntu:bionic
+provisioner:
+  name: ansible
+  lint:
+    name: ansible-lint
+verifier:
+  name: testinfra
+  lint:
+    name: flake8