bugfix: xds route not work with regex

[Bryce-huang]

Issues associated with this PR

#2120

Solutions

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UT result

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Code Style

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[doujiang24]

https://github.com/mosn/mosn/runs/8110553658?check_suite_focus=true#step:4:5608
测试用例失败了，需要处理下的~

[Bryce-huang]

https://github.com/mosn/mosn/runs/8110553658?check_suite_focus=true#step:4:5608 测试用例失败了，需要处理下的~

不知道哪里导致的。。。

[taoyuanyuan]

https://github.com/mosn/mosn/runs/8110553658?check_suite_focus=true#step:4:5608 测试用例失败了，需要处理下的~

不知道哪里导致的。。。

--- FAIL: TestUnmarshalResources (0.02s)
panic: runtime error: invalid memory address or nil pointer dereference [recovered]
	panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x22685d0]

goroutine 21 [running]:
testing.tRunner.func1.1(0x24ef240, 0x36a7810)
	/usr/local/go/src/testing/testing.go:999 +0x51b
testing.tRunner.func1(0xc0002b86c0)
	/usr/local/go/src/testing/testing.go:1002 +0x31a
panic(0x24ef240, 0x36a7810)
	/usr/local/go/src/runtime/panic.go:975 +0x41b
mosn.io/mosn/istio/istio1106/xds/conv.convertRouteAction(0xc000193680, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, ...)
	/go/src/mosn.io/mosn/istio/istio1106/xds/conv/convert_router.go:226 +0x3e0
mosn.io/mosn/istio/istio1106/xds/conv.convertRoutes(0xc00011f760, 0x1, 0x1, 0x0, 0x0, 0x0)
	/go/src/mosn.io/mosn/istio/istio1106/xds/conv/convert_router.go:85 +0x1c1
mosn.io/mosn/istio/istio1106/xds/conv.ConvertRouterConf(0x0, 0x0, 0xc00012fe00, 0x0, 0x26f1500)
	/go/src/mosn.io/mosn/istio/istio1106/xds/conv/convert_router.go:54 +0x28a
mosn.io/mosn/istio/istio1106/xds/conv.(*filterConverter).convertHTTP(0xc00040ede8, 0xc00009c280, 0x0, 0x2a31d00, 0x0, 

[codecov]

Codecov Report

Base: 60.56% // Head: 60.40% // Decreases project coverage by -0.15% ⚠️

Coverage data is based on head (5484f26) compared to base (7609947).
Patch coverage: 40.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2121      +/-   ##
==========================================
- Coverage   60.56%   60.40%   -0.16%     
==========================================
  Files         422      420       -2     
  Lines       36629    36976     +347     
==========================================
+ Hits        22184    22337     +153     
- Misses      12263    12423     +160     
- Partials     2182     2216      +34     

Impacted Files	Coverage Δ
istio/istio1106/xds/conv/convert_router.go	57.83% <40.00%> (-1.02%)	⬇️
pkg/config/v2/server.go	64.70% <0.00%> (-5.51%)	⬇️
...ream/faulttolerance/regulator/default_work_pool.go	88.63% <0.00%> (-4.55%)	⬇️
pkg/stream/http2/var.go	58.69% <0.00%> (-3.81%)	⬇️
pkg/network/listener.go	36.65% <0.00%> (-2.85%)	⬇️
pkg/filter/stream/ipaccess/stream_filter.go	84.37% <0.00%> (-2.73%)	⬇️
pkg/wasm/abi/proxywasm010/factory.go	50.00% <0.00%> (-2.64%)	⬇️
pkg/router/handler.go	57.14% <0.00%> (-2.12%)	⬇️
pkg/router/types.go	48.80% <0.00%> (-1.83%)	⬇️
...kg/upstream/cluster/subset_loadbalancer_builder.go	92.50% <0.00%> (-1.00%)	⬇️
... and 62 more

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[Bryce-huang]

already update，pls review

[Bryce-huang]

done

[3062]

LGTM