We don't need to read the host's hostname through /mnt/root/etc/hostname,
because the hostname is written to config.json on a change. When the hostname
has never changed, it won't be found in config.json, so we can default to
the Supervisor container's /etc/hostname as it will match the host's
/etc/hostname, the network mode being `host`.
Closes: #1968
Change-type: patch
Signed-off-by: Christina Wang <christina@balena.io>
Stability improvements;
* Printing of unsupported compose fields
* Added a lot of tests
* All compose configuration has a default value, enabling better
comparison
Change-type: minor
Signed-off-by: Cameron Diver <cameron@resin.io>