docker support: bind to all network devices

[cforce]

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https://github.com/open-telemetry/opamp-go/blob/c7fc5850ffdf65e97a39b080d73f1f23346bf52a/internal/examples/server/opampsrv/opampsrv.go#L58 pins loop back which fails for containerized setups where 0.0.0.0 is required. Please change to that or at least allow to configure the listening ip