Updated log level to v2 for sysctlFSFileMax.

[gyliu513]

This is very importatnt log for trouble-shooting, we should update
it to v2 by default.

/cc @aledbf

What this PR does / why we need it:

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #

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[k8s-reviewable]

This change is 

[aledbf]

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

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[codecov-io]

Codecov Report

Merging #2137 into master will not change coverage.
The diff coverage is 50%.

@@           Coverage Diff           @@
##           master    #2137   +/-   ##
=======================================
  Coverage   36.59%   36.59%           
=======================================
  Files          68       68           
  Lines        4837     4837           
=======================================
  Hits         1770     1770           
  Misses       2799     2799           
  Partials      268      268

Impacted Files	Coverage Δ
internal/ingress/controller/nginx.go	3.95% <0%> (ø)	⬆️
internal/ingress/controller/util.go	39.13% <100%> (ø)	⬆️

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