imagetest-qemu/runqueue: Since we no longer support BUILDDIR, use TMPDIR
Commit
993672fa2739794a6dd0dbd7bb232fa60522b897 removed the BUILDDIR
support from runqueue which broke the imagetest-qemu integration. We now
therefore need to set TMPDIR and pass this through the environment to
ensure the runqueue script finds the right locations without running
bitbake directly.
This patch also adds a sleep to the qemu command in the error case so that
this remains on the screen for a period of time so the user can see errors
more easily.
This change unbreaks automated testing failures on the autobuilder.
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
