Change cgroups log line from Infof from Debugf

[fearful-symmetry]

What does this PR do?

This is a one-liner that removes an erroneous Infof() debug line that should have been a Debugf() line.

Why is it important?

This can create lots of logging noise.

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have added tests that prove my fix is effective or that my feature works

[cmacknz]

Did a quick spot check and this looks like the only thing that should have been debug level:

❯ rg '\.Info' metric/system
metric/system/host/host.go
80:             info := h.Info()

metric/system/diskio/diskstat_windows_helper.go
144:            logp.L().Named("diskio").Info("The registry key EnableCounterForIoctl at HKLM:SYSTEM\\CurrentControlSet\\Services\\Partmgr has been created in order to enable the performance counters")

metric/system/cgroup/util.go
480:                            logp.L().Infof("using root mount %s and path %s", r.cgroupMountpoints.ContainerizedRootMount, path)

metric/system/cgroup/cgv2/io_helper_linux.go
46:             fInfo, dirErr := d.Info()