If you check logs like [1] it's literally thousands of lines of the
same thing over-and-over as the git caching happens. It is basically
all just noise unless you're debugging it specifically. Up this to
tracing level 2 ("-x -x") to see it. Add a note in the help about
multiple flags, which has always been intended but not documented.
Image builds should continue to run with single "-x", but we could
probably greatly increase signal:noise ratio in the logs with a little
more judicial use of this to turn down some of the very noisy &
repetitive parts.
[1] anything in http://nodepool.openstack.org/
Change-Id: I91c5e55814ba9840769357261d203f4850e2eba6
8c837409b8