Call stop_cvd when launch_cvd times out

In old versions, sending signals to a launch_cvd process does not
terminate all subprocesses. They must be terminated by stop_cvd. This
commit adds stop_cvd to the timeout handler of local instances.

Test: acloud-dev create --local-instance 1 \
      --local-image ~/r_img --local-tool ~/r_cvd -vv
Bug: 203776760
Change-Id: Ieef5468f69b5395a71d23931d5512c0e3e565336
2 files changed