Merge remote-tracking branch 'remotes/afaerber/tags/qtest-for-2.3' into staging

QTest cleanups

* Change fw_cfg-test and i440fx-test GTester paths
* Extend libqtest API as necessary

# gpg: Signature made Mon Mar 30 18:29:39 2015 BST using RSA key ID 3E7E013F
# gpg: Good signature from "Andreas Färber <afaerber@suse.de>"
# gpg:                 aka "Andreas Färber <afaerber@suse.com>"

* remotes/afaerber/tags/qtest-for-2.3:
  i440fx-test: Fix test paths to include architecture
  qtest: Add qtest_add() wrapper macro
  qtest: Add qtest_add_data_func() wrapper function
  fw_cfg-test: Fix test path to include architecture

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