Dropped obsolete module templates

Module templates have little benefit because
* they are not documented anywhere,
* their structure is not suitable for our modules, hence not a
  single module is written according to the templates,
* contributers better base their own modules on existing modules
  because we have modules for most OpenStack components,
* they are outdated, e.g. normalizing is a relict of
  openstacksdk<0.99.0 and results,
* they are bloated, e.g. *_info module is doing preliminary checks
  and creating filters in separate functions which proved in other
  modules to be much better readable when inlined,
* they are hard to understand, e.g. argument_spec definition is
  a huge Jinja2 template which does nothing except for copying
  arguments from one place to another,
* they are not tested.

Change-Id: I460b75c09a361e712bbfb002c1ad1d03b3dff8ee

.zuul.yaml

@@ -36,7 +36,6 @@
       - .*\.rst
       - tools/run-ansible-sanity.sh
       - tests/sanity/.*
-      - contrib/.*
       - .zuul.yaml
     vars:
       zuul_work_dir: src/opendev.org/openstack/ansible-collections-openstack
@@ -264,7 +263,6 @@
       - ^.*\.md$
       - ^.*\.rst$
       - ^changelogs/.*$
-      - ^contrib/.*$
       - ^docs/.*$
       - ^meta/.*$
       - ^requirements.*$