We need the test labels to be reflected in the page id of the exported H...

Currently the "id" field on exported HARs does not contain the test labels which were assigned during test creation. This patch propagates the label value to the exported HAR so that we know which HAR is which
The label should be fetched using getLabel() (in common_lib I believe).  It should also be used in a new field $pd['_label'] or something like that rather than overloading the page ID field.