bug: Custom BGP prefix lists are not imported

[kremerpatrick]

Example error:

Beginning BGP Neighbors...
API Call Status 400, text:{
"httpStatus" : "BAD_REQUEST",
"error_code" : 503047,
"module_name" : "Policy",
"error_message" : "Invalid prefix-list /infra/tier-0s/vmc/prefix-lists/stretch-filter."
}
{"id": "f3eec340-e402-11ea-8356-ab0cb657a449", "neighbor_address": "169.254.111.5", "remote_as_num": "65010", "route_filtering": [{"enabled": true, "address_family": "IPV4", "out_route_filters": ["/infra/tier-0s/vmc/prefix-lists/stretch-filter"]}],
"keep_alive_time": 60, "hold_down_time": 180, "allow_as_in": false, "maximum_hop_limit": 1, "resource_type": "BgpNeighborConfig", "display_name": "f3eec340-e402-11ea-8356-ab0cb657a449", "marked_for_delete": false, "overridden": false}