Fix issue with package loader
Fix issue with package loader

Pagination for Catalog API was introduced in change
If71da70fa835a1ee7a271ebf7238c0a4c64d4123
but package loader was not updated to handle changed
result type for call to GET /catalog/packages

Change-Id: If79efe560801bb33a36e2b0032a71cdbe191fb03
Closes-bug: #1325365

NeCTAR-RC/murano,DavidPurcell/murano_temp,ativelkov/murano-api,NeCTAR-RC/murano,DavidPurcell/murano_temp,olivierlemasle/murano,sergmelikyan/murano,NeCTAR-RC/murano,chenyujie/hybrid-murano,ativelkov/murano-api,satish-avninetworks/murano,NeCTAR-RC/murano,openstack/murano,olivierlemasle/murano,sergmelikyan/murano,satish-avninetworks/murano,telefonicaid/murano,satish-avninetworks/murano,olivierlemasle/murano,olivierlemasle/murano,sajuptpm/murano,chenyujie/hybrid-murano,openstack/murano,satish-avninetworks/murano,DavidPurcell/murano_temp,sajuptpm/murano,DavidPurcell/murano_temp,telefonicaid/murano