Revert "tests: add qmp/qom-set-without-value test"

Markus spotted some issues with this new test case which
unfortunately I didn't notice had been flagged until after
I'd applied the pull request. Revert the relevant commit.

This reverts commit 2b70ea92766f5a1a735a44e28c92cdfba3c4054f.

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