Ansible launcher: initialize pid variables
Ansible launcher: initialize pid variables

These variables were uninitialized, which could cause a problem if
we stopped or released a node which had not run a job.  We would
try to call abortRunningProc before they had been defined.

Change-Id: I79c6b14336b039e0f07727be977c3152fbf190af

wikimedia/integration-zuul,wikimedia/integration-zuul,wikimedia/integration-zuul,gooddata/zuul,gooddata/zuul,gooddata/zuul,wikimedia/integration-zuul,gooddata/zuul,gooddata/zuul