Retry OVS flow checks a few times if they fail
Retry OVS flow checks a few times if they fail

There's no way to tell when the nodes have fully processed the
node/pod/service creation/deletion events, so if the flows look wrong,
assume it's because they haven't been updated yet, and try again
in a few seconds.

Also, tweak the assertions and use of error objects so that when the
flows don't match expectations, the expected/found flows end up logged
in the test output.

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