The default section in an ini file will always be 'DEFAULT', but for some
configuration files you may want to be able to set this to ensure
another section is at the top. 'global' for example, when working with
fio.
This PR adds the ability to set the section to be at the top, but will
default to 'DEFAULT' so no change will happen to existing tasks running
config_template.
Change-Id: Ifbc0b91aef46f3c2d98e73fdc9ab888244550bab