Make note template follow correct formatting
Make note template follow correct formatting

The template used to create a new release note does not follow the ReST
standards[0]. This can be confusing to a contributor who may be
unfamiliar with the formatting requirements, as they will tend to follow
the template format, and end up with incorrect ReST. This patch adds the
required vertical bar and newline to each section.

[0] http://docs.openstack.org/developer/reno/usage.html#formatting

Change-Id: Ie8cbe524376a3c3e1e11446abdc6e5fa00233d51

openstack/reno