[Tests] Fix a typo in the Upload Sync Controller's error management

Signed-off-by: Regis Merlino <regis.merlino@intel.com>
[test] Survive a missing ServiceResetToken in dsc

Signed-off-by: Jussi Kukkonen <jussi.kukkonen@intel.com>
[test] Save changed ServiceResetToken in configuration

Signed-off-by: Jussi Kukkonen <jussi.kukkonen@intel.com>