Add a test that can trigger a map race condition. #192
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I can sporadically catch a data race which could result in the
following error we've seen:
```
fatal error: concurrent map writes
goroutine 200159 [running]:
github.com/utilitywarehouse/semaphore-xds/xds.(*Snapshotter).updateNodeServiceSnapshotResources(0xc000140160, {0xc00a30e080, 0x31}, {0xc001fae040, 0x35}, {0xc002d00160?, 0x2, 0x2})
/go/src/github.com/utilitywarehouse/semaphore-xds/xds/snapshotter.go:403 +0x178
github.com/utilitywarehouse/semaphore-xds/xds.(*Snapshotter).updateNodeSnapshot(0x2128fc0?, {0xc00a30e080, 0x31}, {0xc001fae040, 0x35}, {0xc002d00160, 0x2, 0x2})
/go/src/github.com/utilitywarehouse/semaphore-xds/xds/snapshotter.go:463 +0x259
```
but the result is not reliable enough via `go test -v -race ./...` to
try an effective solution.
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I can sporadically catch a data race which could result in the following error we've seen:
but the result is not reliable enough via
go test -v -race ./...to try an effective solution.