Windows: Use the correct newline sequence for the platform (#21846)

This change to the template action plugin make template use the
platform's native newline_sequence for Jinja.

We also added the option `newline_sequence` to change the newline
sequence using by Jinja if you need to use another newline sequence than
the platform default.

This was previously discussed in
https://github.com/ansible/ansible/issues/16255#issuecomment-278289414

And also relates to issue #21128

test/sanity/code-smell/line-endings.sh

@@ -4,7 +4,9 @@ grep -rIPl '\r' . \
     --exclude-dir .git \
     --exclude-dir .tox \
     | grep -v -F \
-    -e './test/integration/targets/win_regmerge/templates/win_line_ending.j2'
+    -e './test/integration/targets/template/files/foo.dos.txt' \
+    -e './test/integration/targets/win_regmerge/templates/win_line_ending.j2' \
+    -e './test/integration/targets/win_template/files/foo.dos.txt' \
 
 if [ $? -ne 1 ]; then
     printf 'One or more file(s) listed above have invalid line endings.\n'