Stop merging config when symlink points to same file

This can result in duplicated configuration options.

Change-Id: I4dd6ffae027345b8c1cc217a63e85f8af7fc9746
Closes-Bug: #2042689

ansible/roles/kolla-openstack/action_plugins/kolla_custom_config_info.py

@@ -119,6 +119,9 @@ class ConfigCollector(object):
             if not rule:
                 continue
 
+            sources = map(os.path.realpath, sources)
+            sources = _dedup(sources)
+
             if rule["strategy"] == 'copy':
                 copy = {
                     "src": sources[-1],

releasenotes/notes/stop-merging-symlinks-to-identical-files-dfa3593fcf405510.yaml

@@ -0,0 +1,6 @@
+---
+fixes:
+  - |
+    Stop merging config when a symlink points to the same file. This
+    was a common pattern before the merging of kolla config was introduced
+    and results in duplicated config options.