bug: Remove route timeout default value

[chzhuo]

Please answer these questions before submitting a pull request

• Why submit this pull request?

• Bugfix

• New feature provided

• Improve performance

• Backport patches

• Related issues

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Bugfix

• Description
  The controller will set default timeout 60s to the Apisix Route if not assigned timeout in the ApisixRoute CRD
  And The Apisix Route timeout will overwrite the timeout option which set in Upstream configuration.
  

• How to fix?
  Keeping the original logic， not assign default timeout to the Apisix Route

[codecov-commenter]

Codecov Report

Merging #733 (006e956) into master (4a862e2) will increase coverage by 0.25%.
The diff coverage is 20.00%.

@@            Coverage Diff             @@
##           master     #733      +/-   ##
==========================================
+ Coverage   31.70%   31.95%   +0.25%     
==========================================
  Files          66       66              
  Lines        6640     6641       +1     
==========================================
+ Hits         2105     2122      +17     
+ Misses       4280     4271       -9     
+ Partials      255      248       -7     

Impacted Files	Coverage Δ
pkg/kube/translation/apisix_route.go	19.10% <20.00%> (-0.54%)	⬇️
pkg/apisix/route.go	37.76% <0.00%> (+2.09%)	⬆️
pkg/apisix/cluster.go	30.75% <0.00%> (+3.50%)	⬆️
pkg/apisix/plugin.go	100.00% <0.00%> (+20.00%)	⬆️

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[tao12345666333]

hi #754 has been merged to fix e2e CI. Could you please merge from master?

[tao12345666333]

Thanks!