monascaclient was recently migrated to
use 'osc' library. Due to that, exception
classes has been changed. This commit adjusts
the exception class to recently released
monascaclient==1.7.0
Depends-On: Ie647221a3ab055e7b150d65ffb9287b44ef834cb
Change-Id: Icfef345c4269ac4cb682049f22a43fdab3d39845