Adding "follow" param for file/copy options

Also modifies the template action plugin to use this new param
when executing the file/copy modules for templating so that links
are preserved correctly.

Fixes #8998

lib/ansible/utils/module_docs_fragments/files.py

@@ -67,4 +67,12 @@ options:
       - level part of the SELinux file context. This is the MLS/MCS attribute,
         sometimes known as the C(range). C(_default) feature works as for
         I(seuser).
+  follow:
+    required: false
+    default: "no"
+    choices: [ "yes", "no" ]
+    version_added: "1.8"
+    description:
+      - 'This flag indicates that filesystem links, if they exist, should be followed.'
+
 """