chore: clean up useless code

[tao12345666333]

Signed-off-by: Jintao Zhang zhangjintao9020@gmail.com

Type of change:

• Clean up

What this PR does / why we need it:

These codes were introduced in #746.

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 #902 (0a297f3) into master (8348d01) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #902   +/-   ##
=======================================
  Coverage   32.05%   32.06%           
=======================================
  Files          71       72    +1     
  Lines        7775     7776    +1     
=======================================
+ Hits         2492     2493    +1     
  Misses       5009     5009           
  Partials      274      274           

Impacted Files	Coverage Δ
pkg/kube/translation/apisix_route.go	22.43% <ø> (ø)
pkg/kube/translation/util.go	32.71% <ø> (ø)
test/e2e/e2e.go	100.00% <0.00%> (ø)

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