General

Slices are stored only when the request is processed, to avoid cases where slice is stored but the request is not fully processed
Add new error (RuntimeError) to handle cases were the request is processed but no service is created
Change some error raised to be consistent in the whole app
Create flags to select the IP of HRAT and optical planner IPs
Update env.example with new flags
Change build_response to be the same for every request
Planner
Both HRAT and optical planner are configured through ip in the config
Add exception handling in HRAT and optical planner to avoid errors
Add "allowed_ids" variable in energy planner to handle only requests involving specific ids, to avoid errors in energy planning
Realizer
Change e2e realizer to handle cases with no rules avoiding errors
Change e2e_connect to use the tfs_connector class