some bug fix and a new feat

[RayHuangCN]

fix: coordinator: remove all auth in injected config file
fix: coordinator: remove deleted job targets in "discovery" module when config file changed
fix: sidecar: statistic sample before copy data to prometheus
fix: coordinator: wait first service discovery done before coordinator loop
feat: all: support redirect path of serviceaccount token and ca

[codecov]

Codecov Report

Merging #9 (b49b933) into master (a3f507f) will decrease coverage by 1.70%.
The diff coverage is 58.62%.

@@            Coverage Diff             @@
##           master       #9      +/-   ##
==========================================
- Coverage   78.14%   76.44%   -1.71%     
==========================================
  Files          25       25              
  Lines         929      989      +60     
==========================================
+ Hits          726      756      +30     
- Misses        122      139      +17     
- Partials       81       94      +13     

Impacted Files	Coverage Δ
pkg/shard/replicas.go	72.97% <0.00%> (+3.74%)	⬆️
pkg/sidecar/proxy.go	86.66% <0.00%> (ø)
pkg/target/status.go	100.00% <ø> (ø)
pkg/shard/group.go	70.31% <33.33%> (-2.27%)	⬇️
pkg/coordinator/coordinator.go	70.83% <43.75%> (-5.00%)	⬇️
pkg/prom/commonapi.go	53.84% <50.00%> (-12.83%)	⬇️
pkg/coordinator/service.go	75.71% <58.33%> (ø)
pkg/sidecar/service.go	59.25% <59.25%> (ø)
pkg/discovery/discovery.go	82.25% <78.94%> (+0.43%)	⬆️
pkg/sidecar/injector.go	80.51% <100.00%> (+2.59%)	⬆️
... and 2 more

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