Merge remote-tracking branch 'remotes/famz/tags/testing-pull-request' into staging

Testing patches

# gpg: Signature made Mon 09 Apr 2018 08:18:02 BST
# gpg:                using RSA key CA35624C6A9171C6
# gpg: Good signature from "Fam Zheng <famz@redhat.com>"
# Primary key fingerprint: 5003 7CB7 9706 0F76 F021  AD56 CA35 624C 6A91 71C6

* remotes/famz/tags/testing-pull-request:
  docker: fedora: test more components
  docker: Inline "prep_fail" in run script
  tests: Fix ubuntu.i386 image initialization
  docker: dump 'config.log' if ./configure fails

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>