commit 316ebd3c1ad568e13cbc8c26c7a158e9a7a8c4f6
author Andrew Jeffery <andrew@aj.id.au> Thu Mar 08 13:05:32 2018 +1030
committer Andrew Jeffery <andrew@aj.id.au> Tue Mar 20 07:40:16 2018 +1030
tree ffc95d6bb5194035ec1b3b654cbd1c9d21fdcc72
parent 0b252e3290dcc06752f1fd4d2700eeba9b013082

run-unit-test-docker.sh: Don't force ubuntu:latest

Allow ubuntu docker images other than the 'latest' tag to run. 'latest'
points to Ubuntu 16.04 on Docker Hub[0], which isn't really what we're
after.

This leaves in place forcing Fedora to be Ubuntu, but that should
probably change as well.

[0] https://hub.docker.com/_/ubuntu/

Tested: Ran `DISTRO=ubuntu:artful ./run-unit-test-docker.sh` and
verified the environment was Artful.

Change-Id: Ibdcab220db7388e0f1153337cbde01fc4b898883
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>