Inventory/host_vars cleanup.

- hosts: remove gw-replacement2/3.local.netz and k1371.dyndns.org
  (duplicate of gw-ak.oopen.de).
- host_vars: move obsolete host directories to host_vars/DELETED/
  (devel-cloud, file-blkr-alt, file-ipa, ga-campus-gw-temp, ga-st-mm,
  gitea.so36.net, nc-gw, moodle, nscache, server16, server20, web-test,
  gw-replacement2/3/4).
- host_vars: fix file names (ga-al-gw-common.yml,
  gw-replacement.local.netz/gw-replacement-common.yml) and the header of
  mm-nd-test-ipt-server.yml.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

host_vars/DELETED/file-ipa.local.netz/file-ipa-common.yml

@@ -0,0 +1,78 @@
+---
+
+# ---
+# vars used by roles/ansible_dependencies
+# ---
+
+
+# ---
+# vars used by roles/ansible_user
+# ---
+
+
+# ---
+# vars used by roles/common/tasks/basic.yml
+# ---
+
+
+# ---
+# vars used by roles/common/tasks/sshd.yml
+# ---
+
+
+# ---
+# vars used by roles/common/tasks/apt.yml
+# ---
+
+install_compiler_pkgs: true
+
+
+# ---
+# vars used by roles/common/tasks/users.yml
+# ---
+
+
+# ---
+# vars used by roles/common/tasks/users-systemfiles.yml
+# ---
+
+
+# ---
+# vars used by roles/common/tasks/webadmin-user.yml
+# ---
+
+
+# ---
+# vars used by roles/common/tasks/sudoers.yml
+# ---
+#
+# see: roles/common/tasks/vars
+
+
+# ---
+# vars used by roles/common/tasks/caching-nameserver.yml
+# ---
+
+
+# ---
+# vars used by roles/common/tasks/git.yml
+# ---
+#
+# see: roles/common/tasks/vars
+
+
+# ---
+# vars used by roles/common/tasks/copy_files.yml
+# ---
+
+
+# copy_template_files: []
+#
+#  - name: mailsystem_install_amavis.conf
+#    src_path: usr/local/src/mailsystem/conf/install_amavis.conf.j2
+#    dest_path: /usr/local/src/mailsystem/conf/install_amavis.conf
+
+
+# ---
+# vars used by roles/common/tasks/config_files_mailsystem_scripts.yml
+# ---