commands: RunCrosSigningTests inside chroot.

CrosSigning tests depend on packages that don't always exist outside
the chroot.

BUG=None
TEST=cbuildbot --remote -g N  signer-pre-cq

Change-Id: Idb2e3d484c5dfc16883cf452795ced7bc9222490
Reviewed-on: https://chromium-review.googlesource.com/411363
Commit-Ready: Don Garrett <dgarrett@chromium.org>
Tested-by: Don Garrett <dgarrett@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
1 file changed