OTEL all-in-one --help hangs

[albertteoh]

Describe the bug
May be related to #2566.

Running go run ./cmd/all-in-one --help prints help documentation, but appears to hang afterwards.

To Reproduce
Steps to reproduce the behavior:

1. cd cmd/opentelemetry
2. go run ./cmd/all-in-one --help

Output:

Jaeger OpenTelemetry all-in-one

Usage:
  jaeger-opentelemetry-all-in-one [flags]
...
      --sampling.strategies-file string                    The path for the sampling strategies file in JSON format. See sampling documentation to see format of the file
^Csignal: interrupt

Expected behavior
Print help documentation and exit successfully.

Screenshots

Version (please complete the following information):

• OS: macOS
• Jaeger version: master
• Deployment: Development

What troubleshooting steps did you try?

Additional context

[yurishkuro]

Is it just all-in-one or other otel binaries too?

[albertteoh]

Is it just all-in-one or other otel binaries too?

@yurishkuro just otel all-in-one. All other binaries otel and non-otel exit successfully after printing help.