Disable jinja2 trim_blocks feature

otherwise, if the jinja2 blocks at the end of the line, it will remove
the last newline character and join two lines into one.

Change-Id: Ie710342fb034e477ff854eba3915dd845bddd257

ansible/roles/haproxy/templates/haproxy.cfg.j2

+#jinja2: trim_blocks: False
 {% set tls_bind_info = 'ssl crt /etc/haproxy/haproxy.pem' if kolla_enable_tls_external | bool else '' %}
 global
   chroot /var/lib/haproxy