fix(seldon operator): "Deployment differs"-logs will never show

[caozhuozi]

What this PR does / why we need it:

The PR tries to fix #5140

Which issue(s) this PR fixes:

Fixes #5140

Special notes for your reviewer:

I think I already provided enough information on the issue page.
To emphasize, I mirrored some important conclusions here:

1. an important fact about zap and logr (zapr): https://github.com/go-logr/zapr#increasing-verbosity
2. the following code can reproduce the issue and back my findings:

   package main
   
   import (
      "go.uber.org/zap"
      zapf "sigs.k8s.io/controller-runtime/pkg/log/zap"
   )
   
   func main() {
   
     level := zap.DebugLevel
   
     atomicLevel := zap.NewAtomicLevelAt(level)
   
     logger := zapf.New(
   	  zapf.UseDevMode(false),
   	  zapf.Level(&atomicLevel),
     )
       
         // For DebugLevel, Only When `V` is set to 1, the log can be shown
     logger.V(5).Info("log sth")
   }

3. Also note that when V is set to 1, for zap's InfoLevel, the log will not shown. I think this is the original design?

[seldondev]

Hi @caozhuozi. Thanks for your PR.

I'm waiting for a SeldonIO or todo 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.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

I understand the commands that are listed here.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the jenkins-x/lighthouse repository.