Sentry: Fix root cause of gateway_mfr exited with a non-zero status

[marvinmarnold]

Follow up to:

• https://github.com/NebraLtd/hm-diag/issues/352

Related work:

• https://github.com/NebraLtd/hm-diag/pull/359/files
• https://github.com/NebraLtd/helium-miner-software/pull/448

Source code:

• https://github.com/NebraLtd/hm-pyhelper/blob/77eb361e2fe1510d088beb5499c15e1d25c78add/hm_pyhelper/miner_param.py#L42

Thoughts:

• There are many different possible errors, and we don't have a handle on what is causing them.

[shawaj]

Related to #348 and #425