refactor: remove BaseURL and AdminKey in config

[zaunist]

Type of change:

• Bugfix
• New feature provided
• Improve performance
• Backport patches

What this PR does / why we need it:

Remove BaseURL and AdminKey.

Pre-submission checklist:

• Did you explain what problem does this PR solve? Or what new features have been added?
• Have you added corresponding test cases?
• Have you modified the corresponding document?
• Is this PR backward compatible? If it is not backward compatible, please discuss on the mailing list first

[codecov-commenter]

Codecov Report

Merging #826 (0c7be4f) into master (990971d) will decrease coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #826      +/-   ##
==========================================
- Coverage   32.14%   32.09%   -0.06%     
==========================================
  Files          71       71              
  Lines        7727     7721       -6     
==========================================
- Hits         2484     2478       -6     
  Misses       4968     4968              
  Partials      275      275              

Impacted Files	Coverage Δ
cmd/ingress/ingress.go	77.55% <ø> (-0.45%)	⬇️
pkg/config/config.go	64.64% <ø> (-1.38%)	⬇️

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[tokers]

This is a broken change and we should add some hints for users.

[tao12345666333]

LGTM.

[tao12345666333]

Thanks! The code LGTM.

I added the do-not-merge/hold label, and I want to perform additional checks and remind more people to pay attention to this change.

Will be merged after the bi-weekly meeting next week.

[zaunist]

This is a broken change and we should add some hints for users.

Sure, I think so.

[tao12345666333]

LGTM