Enabling indentation rule for yamllint.

With the exception of release notes, yaml files will
now have to be indented with a consistent number of whitespace chars.

As described:
https://yamllint.readthedocs.io/en/stable/rules.html#module-yamllint.rules.indentation

Also fixes indentaion for the zuul.d/molecule.yaml.

Signed-off-by: Jiri Podivin <jpodivin@redhat.com>
Change-Id: I280cea451114a0c63bec9ae0f4dc2c85e3d3de90
(cherry picked from commit c1277a5e5c)

.yamllint

@@ -5,7 +5,9 @@ rules:
   line-length:
     # matches hardcoded 160 value from ansible-lint
     max: 160
-
+  indentation:
+    spaces: consistent
+    indent-sequences: true
+    check-multi-line-strings: false
 ignore: |
-  zuul.d/*.yaml
   releasenotes/notes/*.yaml

zuul.d/molecule.yaml

@@ -351,20 +351,20 @@
       tripleo_validations_role_name: overcloud_service_status
 - job:
     files:
-    - ^roles/check_uc_hostname/.*
-    - ^tests/prepare-test-host.yml
-    - ^ci/playbooks/pre.yml
-    - ^ci/playbooks/run.yml
+      - ^roles/check_uc_hostname/.*
+      - ^tests/prepare-test-host.yml
+      - ^ci/playbooks/pre.yml
+      - ^ci/playbooks/run.yml
     name: tripleo-validations-centos-8-molecule-check_uc_hostname
     parent: tripleo-validations-centos-8-base
     vars:
       tripleo_validations_role_name: check_uc_hostname
 - job:
     files:
-    - ^roles/check_for_dangling_images/.*
-    - ^tests/prepare-test-host.yml
-    - ^ci/playbooks/pre.yml
-    - ^ci/playbooks/run.yml
+      - ^roles/check_for_dangling_images/.*
+      - ^tests/prepare-test-host.yml
+      - ^ci/playbooks/pre.yml
+      - ^ci/playbooks/run.yml
     name: tripleo-validations-centos-8-molecule-check_for_dangling_images
     parent: tripleo-validations-centos-8-base
     vars: