Crash reporter integration

This set of patches integrates rich cores uploaded to telemetry server into test reports.

It extends testrunner-lite's XML report so that when crash-reporter uploads a rich core, URL of processed crash report is added to corresponding test case:

`<crash url="https://telemetry.server.com:443/#submissions/2417">fakeCrash-Device-11-28261.rcore.lzo</crash>`

To collect the cores, a directory where rich-core-dumper stores the reports has to be specified as an argument to testrunner-lite. One can also specify how long (in seconds) testrunner will wait for the rich cores to be uploaded to server, e.g.:

`testrunner-lite -f tests.xml -o result.xml --rich-core-dumps=/var/cache/core-dumps -T 120`

Relevant changes to sp-rich-core can be found at https://github.com/xhaakon/sp-rich-core/commit/c2e9e73b8e0084266b702fc5ed493d1b84dccea2