Catch DBDuplicateEntry exception
Catch DBDuplicateEntry exception

Since fqn is unique we need to catch this exception

Change-Id: I882701afbebb3f007125bae173748be378e8ca51

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