The executors are in a loop trying to clone nova.
They start trying to refresh
/var/lib/zuul/executor-git/opendev.org/openstack/nova, it times out
after the default 5 minutes, they delete the directory and try again
... over and over. All 12 of them doing this at once kills gerrit
trying to serve nova in an endless loop.
Manual testing has shown that it takes about 7 minutes, so 10 minutes
gives us some headroom. The repo is now ~2gb I'm guessing after the
notedb changes.
Change-Id: Ie7b4268c0db447717b827dd005bb7cad3ccfbee3
2e92da9351