lava: Fit more info in the test job name

Current job names look like this:

LXC test on 18.06.0 Tiny container test on AMD64 20180717.1

This is at the very least confusing since it is actually for the 18.09 release of the containers (which is not mentioned) while 18.06.0 is only the image used as for the host.

The new format looks like this: LXC Tiny container test amd64/uefi 18.09 20180717.0 on 18.06.0

With the new format the container release is clearly indicated and the templating is simplified slightly.

The "tiny" is left uppercased as LAVA searches are case sensitive so searching jobs for "Tiny" would yield both the old and new jobs.

Signed-off-by: Emanuele Aina emanuele.aina@collabora.com