Allow DNS update with no downtime

[flochaz]

Context

Current update of domain_name in 1-SDLC-Organization's cdk.json file will create a new zone and sub domains properly but delete the old one making all apps dependent on this unreachable while new domain_name is updated in each apps.

Solution

Allow array of domain names to enable 3 waves updates (1. add new one 2. update apps 3. delete old one) and as well enable multi domains feature.