tests: set _CONTAINERS_USERNS_CONFIGURED=done for libnetwork #5574
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What type of PR is this?
/kind other
What this PR does / why we need it:
Starting in common 0.59.1, github.com/containers/common's libnetwork no longer attempts to detect when it's running in a user namespace to decide where a lock file that it uses will be. Since this test is doing user namespace setup on its own as part of the test, we need to explicitly tell it to not use the one that belongs to the node's root user.
How to verify it
Updated integration test!
Which issue(s) this PR fixes:
Unblocks #5567.
Special notes for your reviewer:
Does this PR introduce a user-facing change?