Modify the following files to test runqemu:
targetcontrol.py
utils/commands.py
utils/qemurunner.py
We need simulate how "runqemu" works in command line, so when test
"runqemu", the targetcontrol.py, utils/commands.py and
utils/qemurunner.py don't have to find the rootfs or set env vars.
[YOCTO #10249]
Signed-off-by: Robert Yang <liezhi.yang@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
