Gerrit 3.3 has released. Lets start building images for it so that we
can do testing when ready to start that.
We also add testing files to the list of things that trigger the 3.3
builds. Strictly this isn't necessary since the test will continue to
use 3.2 images until we upgrade to 3.3, but this helps us avoid
forgetting to do this when we do upgrade. Little extra jobs run today to
ensure we continue to run the right jobs tomorrow.
Change-Id: Ib7e7d7313e0827a40009df840119444611d74ca2
7320c8e6ed