Optimize(pisa-proxy, rewrite): optimize sharding_rewrite to reduce code.

[xuanyuan300]

Signed-off-by: xuanyuan300 xuanyuan300@gmail.com

What is changed and how it works?

What's Changed:

1. Optimize sharding_rewrite to reduce code.

[codecov[bot]]

Codecov Report

Merging #370 (1649fca) into master (df61eb4) will increase coverage by 7.88%. The diff coverage is 85.09%.

@@            Coverage Diff             @@
##           master     #370      +/-   ##
==========================================
+ Coverage   66.97%   74.86%   +7.88%     
==========================================
  Files           7        6       -1     
  Lines         427      716     +289     
==========================================
+ Hits          286      536     +250     
- Misses        133      169      +36     
- Partials        8       11       +3     

Flag	Coverage Δ
unittests	74.86% <85.09%> (+7.88%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pisa-controller/pkg/proxy/server.go	20.00% <0.00%> (-2.23%)	:arrow_down:
pisa-controller/pkg/webhook/server.go	26.66% <0.00%> (ø)
pisa-controller/pkg/proxy/http.go	51.35% <44.11%> (-6.55%)	:arrow_down:
pisa-controller/pkg/webhook/injection.go	59.02% <82.56%> (+20.08%)	:arrow_up:
pisa-controller/pkg/proxy/builder.go	94.62% <99.15%> (+3.40%)	:arrow_up:

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