Fix section on iniset for max_template_size

The section was not specified, leading to trying to create a section of
max_template_size.

Change-Id: Ie3b525030efa780e9cef2d3108be92169d400857
Merge "Fix section on iniset for max_template_size"
Merge branch 'master' of github.com:openstack-dev/devstack