Abort package testing job in case it becomes useless

To save computing resource of our package testing servers the following optimizations are proposed.

* Abort deploy testing if installation test fails. Installation testing job will only abort corresponding (deb, rpm) deploy testing job for the same patchset.
* Abort testing jobs if new patchset was uploaded. Build job will abort corresponding (deb, rpm) installation and deploy testing jobs for all previous patchsets.

Here abort means "cancel items in the queue and abort running jobs". Should be implemented as a python script executed from some special job.