restore: fix missing network setup

[Luap99]

The restore code path never called completeNetworkSetup() and this means that hosts/resolv.conf files were not populated. This fix is simply to call this function. There is a big catch here. Technically this is suposed to be called after the container is created but before it is started. There is no such thing for restore, the container runs right away. This means that if we do the call afterwards there is a short interval where the file is still empty. Thus I decided to call it before which makes it not working with PostConfigureNetNS (userns) but as this does not work anyway today so I don't see it as problem.

Fixes #22901

Does this PR introduce a user-facing change?

Fixed a bug where /etc/hosts and /etc/resolv.conf in the container were empty after checkpoint restore.

[openshift-ci[bot]]

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This pull-request has been approved by: Luap99

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[rhatdan]

LGTM

[baude]

/lgtm