json2junit: Handle `ERROR` result status
json2junit: Handle `ERROR` result status

Tests marked as errors were being reported as passing, because the
`ERROR` status was not handled.

Signed-off-by: Alberto Mardegan <e00719d315883e730fe12bc051398152c4c6bd2d@luxoft.com>

Pelagicore/vagrant-cookbook,Pelagicore/vagrant-cookbook,Pelagicore/vagrant-cookbook