Make sure CRB repository is enabled

The augeas-devel package is provided by the CRB repository so it should
be enabled in advance. Currently CRB repository is enabled in the OS
image used in CI so we don't have to enable it explicitly but we should
not assume that the repo is always enabled.

Change-Id: I264dad066ad1c0563ab5ff35da7de71f3b8d4e72
Signed-off-by: Takashi Kajinami <kajinamit@oss.nttdata.com>

playbooks/prepare-node-common.yaml

@@ -32,6 +32,12 @@
         become: true
         with_items: "{{ dnf_modules | default({}) | dict2items }}"
 
+      - name: Enable CRB (CentOS/RHEL)
+        shell:
+          cmd: |-
+            dnf config-manager --enable crb
+        become: true
+
       - name: Install Ruby dependencies (CentOS/RHEL)
         dnf:
           name: "{{ item }}"