Changes around `ims_service_name`

Aleksandr Kurbatovrequested to merge
feature/nat-1168-l2c-description into develop

If custom_service_name is passed from GSO, use this; else construct ims_service_name according to the agreed algorithm, and use in the service description after #.

  • partners_sorted - always use partners names sorted in alphabetical order in the service description.

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