Killing action runner process should set running actions state to "abandoned" and not "failed"

[lakshmi-kannan]

In systemd hosts like U16 and EL7, running something like

st2 run core.local cmd="sleep 180; echo covfefe" timeout=300 -a; sleep 30; sudo systemctl stop st2actionrunner; sleep 10; st2 execution list

shows action status as ```failedand notabandoned``.

NOTE: This does not happen always. So I believe there is a race of some sort in U16.

[m4dcoder]

The liveaction has already failed as a result of shutdown by the time the abandon process runs.

[m4dcoder]

The logic here https://github.com/StackStorm/st2/blob/master/contrib/runners/local_runner/local_runner.py#L177 for the local runner was triggered on u16 before the parent worker process it as abandoned.

[m4dcoder]

So, on u16, looks like SIGTERM is sent to the subprocess first and the local runner is treating it as failed status. Maybe the fix would be to set the state to ABANDONED at https://github.com/StackStorm/st2/blob/master/contrib/runners/local_runner/local_runner.py#L177 when SIGTERM is the exit code (or -15 per https://docs.python.org/2/library/subprocess.html?highlight=returncode#subprocess.Popen.returncode since SIGTERM is 15).

[m4dcoder]

Partial fix at #3457