[WIP] Fix switch modeling and deletions

[agrare]

Fix the modeling of distributed and host-local switches. Currently switches are only referenced through host_switches which means we cannot do association based deletions.

This changes distributed_virtual_switches to be owned by the EMS, and host_virtual_switches to be owned by their host. This also means that the uid_ems is correctly unique under its parent, and deletions can be handled by the association and by cascade deletes.

Fixes #17383

Depends on: ManageIQ/manageiq-schema#200

TODO

• Update VMware refresh_parser and graph_refresh - Update refresh for switch model changes manageiq-providers-vmware#260
• Update Ovirt refresh_parser and graph refresh - Update Ovirt for the new switch modeling manageiq-providers-ovirt#239

[miq-bot]

Checked commits agrare/manageiq@f48157d~...f45f1fd with ruby 2.3.3, rubocop 0.52.1, haml-lint 0.20.0, and yamllint 1.10.0
6 files checked, 3 offenses detected

app/models/ems_refresh/save_inventory_infra.rb

• ❗ - Line 138, Col 18 - Style/SymbolArray - Use %i or %I for an array of symbols.
• ❗ - Line 325, Col 58 - Style/SymbolArray - Use %i or %I for an array of symbols.

app/models/manageiq/providers/infra_manager/distributed_virtual_switch.rb

• ❗ - Line 2, Col 3 - Rails/InverseOf - Specify an :inverse_of option.

[miq-bot]

This pull request is not mergeable. Please rebase and repush.