Make External-facing networks available to all tenants
Make External-facing networks available to all tenants

External-facing networks, at least in Openstack, are supposed
to be scoped to all tenants. This updates the tenant_id
clause for CloudNetworks to consider whether external_facing
is true when deciding whether to allow a tenant to see a network.

Fixes https://bugzilla.redhat.com/show_bug.cgi?id=1779536

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