Sometimes, trove image builds fail because of package authentication
issues. This is often times related to the inability to get to a key
server, and not indicative of anything more serious than that.
The (strongly discouraged in production use cases) workaround for this
is to pass the --allow-unauthenticated option to apt-get install.
I say 'Closes-Bug' below but I realize that this is a white lie. What
it fixes is only the Trove elements. The image build process uses
elements from other places (triple-o, for example). These can still
fail for the same reason.
There is a much bigger hammer that we can use if we need it, and that
is to throw the line 'APT::Get::AllowUnauthenticated "true";' into a
conf file in /etc/apt/apt.conf.d/.
If this hammer isn't big enough, we can revist later.
Change-Id: I009697332bb2a8e1e60b17c10944faed5c311da3
Closes-Bug:#1646856
ae74cd056e