manager: require higher verbosity level for container info misses

[hhromic]

This PR increases the required verbosity level for logging container stats info misses such as:

manager.go:694] Error getting data for container / because of race condition

When not scrapping root container metrics (using -disable_root_cgroup_stats), the above log message is repeated for every metrics scrape request. The error in this case is expected due to to the container stats info not having stats for /.

Fixes #3407
Similar to #3341

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[k8s-ci-robot]

Hi @hhromic. Thanks for your PR.

I'm waiting for a google member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[dims]

/ok-to-test

[dims]

LGTM