Clean up libovsdbops & tests once referential integrity support is added to the test server

[jcaamano]

Many of our libovsdb ops delete rows that would otherwise be garbage collected by the real OVSDB server.

One of the main reasons we do that is because our test server does not have support for garbage collection. So our code either does delete ops that wouldn't be strictly necessary, which requires for us to be extra careful to not incur in referential integrity violations that could happen if we deleted rows that are still referenced from other places; or if we don't do those delete ops, to account for the leftover rows in the tests potentially hiding other issues.

There is ongoing effort to add referential integrity support in the test server: ovn-org/libovsdb#375

When that is done, we need to:

• bump libovsdb, fixing our tests of referential integrity violations and cleaning up all leftovers that will now be garbage collected
• go through our delete ops and remove those that are covered by garbage collection

[github-actions]

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[tssurya]

#4079 fixed this, closing this