Allow Tempest CI to add txt extensions to ini files
Allow Tempest CI to add txt extensions to ini files

When looking at logs of the CI it's useful to be able to read certain
files in the browser. Most plain text files get a txt extension to allow
easier consumption. INI files lack this and thus are downloaded.

This patch allows the Tempest CI to add this extension to INI files.

Change-Id: I05ce7e28148d4edaf32049cc20065a5de5f5dbfc

openstack/networking-odl,openstack/networking-odl,openstack/networking-odl