RFC device-crash-test: device_add test mode

This series implements device_add testing on device-crash-test. The new test mode will be enabled by default in addition to the old test cases, but if only device_add testing is wanted, it can be specified using the '-t' command-line option, e.g.:

  $ ./scripts/device-crash-test -t method=device_add

In comparison to the "-device" test cases, a full test run runs reasonably quickly (17 seconds on my machine for testing all hotpluggable devices on all 72 machine-types in qemu-system-x86_64). I believe it is a good candidate to be eventually included on "make check".

TODO:
* Fix the QEMU crash found using '-t plug_all=1' (see patch 5/5 for details)
* Test non-x86 architectures
* Compare results with Thomas' HMP unit test ("tests: Add a device_add/del HMP test" patch").

Based-on: [email protected] (Subject: [PATCH 0/4] qmp: query-device-type command)

Eduardo Habkost (6):
device-crash-test: Make whitelist code a bit more flexible
device-crash-test: Log detailed info on success too
device-crash-test: Allow checkOneCase() to report multiple results
device-crash-test: Exit immediately on fatal failures on quick mode
device-crash-test: Basic device_add support
device-crash-test: Multi-device device_add test

 scripts/device-crash-test | 132 +++++++++++++++++++++++++++++++++-------------
 1 file changed, 94 insertions(+), 38 deletions(-)

2.13.5