CI Jenkinsfile: Rotate workspaces, cleanup job in testers array
CI Jenkinsfile: Rotate workspaces, cleanup job in testers array

Workspace is renamed after build stage, and deleted later.
This takes workspace cleanup off the main job synhronous path
and runs it after build stage, in parallel with tester jobs.
Few recent workspaces remain accessible for post-build examination.

Signed-off-by: Olev Kartau <daa0e368367f231b2eec38ece459024257643988@intel.com>

klihub/intel-iot-refkit,YinThong/intel-iot-refkit,YinThong/intel-iot-refkit,jairglez/intel-iot-refkit,klihub/intel-iot-refkit,ipuustin/intel-iot-refkit,intel/intel-iot-refkit,jairglez/intel-iot-refkit,intel/intel-iot-refkit,ipuustin/intel-iot-refkit,ipuustin/intel-iot-refkit,mythi/intel-iot-refkit,mythi/intel-iot-refkit,intel/intel-iot-refkit,jairglez/intel-iot-refkit,jairglez/intel-iot-refkit,klihub/intel-iot-refkit,ipuustin/intel-iot-refkit,ipuustin/intel-iot-refkit,jairglez/intel-iot-refkit,YinThong/intel-iot-refkit,intel/intel-iot-refkit,intel/intel-iot-refkit,mythi/intel-iot-refkit,intel/intel-iot-refkit,mythi/intel-iot-refkit,mythi/intel-iot-refkit,ipuustin/intel-iot-refkit,YinThong/intel-iot-refkit,YinThong/intel-iot-refkit,klihub/intel-iot-refkit,klihub/intel-iot-refkit,YinThong/intel-iot-refkit,mythi/intel-iot-refkit,ipuustin/intel-iot-refkit,klihub/intel-iot-refkit,intel/intel-iot-refkit,mythi/intel-iot-refkit,jairglez/intel-iot-refkit,klihub/intel-iot-refkit,YinThong/intel-iot-refkit,jairglez/intel-iot-refkit