command modules: optional stdin_add_newline (#45170)

* stdin_add_newline: allow newline suppression on command modules

* command/shell: test for stdin_add_newline

* changelog for stdin_add_newline

lib/ansible/modules/commands/shell.py

@@ -60,6 +60,12 @@ options:
     description:
       - Set the stdin of the command directly to the specified value.
     version_added: "2.4"
+  stdin_add_newline:
+    type: bool
+    default: yes
+    description:
+      - If set to C(yes), append a newline to stdin data.
+    version_added: "2.8"
 notes:
   -  If you want to execute a command securely and predictably, it may be
      better to use the M(command) module instead. Best practices when writing