Silence ansible-lint

Add tags to tell ansible-lint to ignore the problems found since
those are false positives.

Needed-By: I16186c929e7d0e6e34b35271559e555255a52b00
Change-Id: I59e5d41a9539671ee5aab9b9036379eb9101d021

roles/revoke-sudo/tasks/main.yaml

@@ -6,3 +6,6 @@
 
 - name: Prove that general sudo access is actually revoked.
   shell: '! sudo -n true'
+  tags:
+    # We really need shell above, skip warning
+    - skip_ansible_lint

roles/version-from-git/tasks/main.yaml

@@ -4,6 +4,10 @@
   register: scm_sha_output
   args:
     chdir: "{{ zuul_work_dir }}"
+  # Skip linting since it triggers on the "git" command,
+  # but rev-parse is not supported by ansible git module.
+  tags:
+    - skip_ansible_lint
 
 - name: Set scm_sha fact
   set_fact: