fix(configuration): juju related changes to honor descriptor changes...

fix(configuration): juju related changes to honor descriptor changes introduced in v8 and fixes for new configuration model

Change-Id: Ib5131a94b944c1aed985c2a612cf2b5d871673de
Signed-off-by: bravof <fbravo@whitestack.com>
Signed-off-by: garciaale <agarcia@whitestack.com>