docker: cleanup temp directory after test

There are temp directories named "docker-src.*" after doing docker
tests.  I don't see much point in keeping that (it only contains the
qemu.tar which is exactly current tree, and the copied "run" file).
Let's remove it after test finished.

CC: "Alex Bennée" <alex.bennee@linaro.org>
CC: Fam Zheng <famz@redhat.com>
CC: "Philippe Mathieu-Daudé" <f4bug@amsat.org>
Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <20171017071247.32355-1-peterx@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Fam Zheng <famz@redhat.com>
1 file changed