Skip generating proto for kubernetes apis in vendor

[RainbowMango]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:
Skip generates proto files in vendor.

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

As per the help of --apimachinery-packages, directories prefixed with - are not generated:

--apimachinery-packages string     comma-separated list of directories to get apimachinery input types from which are needed by any API. Directories prefixed with '-' are not generated, directories prefixed with '+' only create types with explicit IDL instructions. (default "+k8s.io/apimachinery/pkg/util/intstr,+k8s.io/apimachinery/pkg/api/resource,+k8s.io/apimachinery/pkg/runtime/schema,+k8s.io/apimachinery/pkg/runtime,k8s.io/apimachinery/pkg/apis/meta/v1,k8s.io/apimachinery/pkg/apis/meta/v1beta1,k8s.io/apimachinery/pkg/apis/testapigroup/v1")

Does this PR introduce a user-facing change?:

NONE

[RainbowMango]

/assign @Garrybest
You might be glad to see this :)

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 28.20%. Comparing base (c8acebc) to head (07dfd3a).

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5149      +/-   ##
==========================================
- Coverage   28.21%   28.20%   -0.01%     
==========================================
  Files         632      632              
  Lines       43568    43568              
==========================================
- Hits        12291    12290       -1     
+ Misses      30381    30380       -1     
- Partials      896      898       +2     

Flag	Coverage Δ
unittests	28.20% <ø> (-0.01%)	⬇️

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[Garrybest]

/lgtm

Thanks @RainbowMango, I didn't know we can skip generating by adding the prefix - before.