added log level for skipped policy

[NoSkillGirl]

Related issue

closes #1206

What type of PR is this?

/kind feature

Proposed changes

• removed printing skipping statement for policy
• added log level
• error message in log gives the name of variables in the policy
  (changes done in - Cleanup/policyreport cli #1279)

Checklist

• I have read the contributing guidelines.
• I have added tests that prove my fix is effective or that my feature
  works.
• I have added or changed the documentation.

[NoSkillGirl]

If the policy is skipped:

$ kyverno apply ../../../samples/best_practices/add_ns_quota.yaml -r ../../../../experiments/debugging/nginx1.yaml

applying 1 policy to 1 resource... 

pass: 0, fail: 0, warn: 0, error: 0, skip: 1 

To check the details need to run with log level:

$ kyverno apply ../../../samples/best_practices/add_ns_quota.yaml -r ../../../../experiments/debugging/nginx1.yaml -v=3
I1126 10:56:41.635111   55104 policymutation.go:202] apply "msg"="generated JSON Patch to set default"  "spec.validationFailureAction"="audit"
I1126 10:56:41.635266   55104 policymutation.go:173] apply "msg"="generated JSON Patch to set default"  "spec.background"=true
I1126 10:56:41.635345   55104 policymutation.go:240] apply "msg"="auto generating rule for pod controllers"  "controllers"="DaemonSet,Deployment,Job,StatefulSet,CronJob"
I1126 10:56:41.635409   55104 policymutation.go:375] apply/generateRuleForControllers "msg"="processing rule"  "rulename"="generate-resourcequota"
I1126 10:56:41.635439   55104 cronjob.go:21] apply/handleCronJob "msg"="generating rule for cronJob"  
I1126 10:56:41.635455   55104 policymutation.go:375] apply/handleCronJob/generateRuleForControllers "msg"="processing rule"  "rulename"="generate-resourcequota"
I1126 10:56:41.635475   55104 policymutation.go:375] apply/generateRuleForControllers "msg"="processing rule"  "rulename"="generate-limitrange"
I1126 10:56:41.635492   55104 cronjob.go:21] apply/handleCronJob "msg"="generating rule for cronJob"  
I1126 10:56:41.635508   55104 policymutation.go:375] apply/handleCronJob/generateRuleForControllers "msg"="processing rule"  "rulename"="generate-limitrange"

applying 1 policy to 1 resource... 
I1126 10:56:41.657909   55104 command.go:231]  "msg"="skipping policy add-ns-quota"  "error"="policy have variable -  {{request.object.metadata.name}}"

pass: 0, fail: 0, warn: 0, error: 0, skip: 1