shine cannot unload modules when using the lnet.service about shine HOT 3 OPEN

I think running lnetctl lnet configure + lnetctl import <configured file> after module load and runing lnetctl lnet unconfigure before module unload might make more sense.

The lnet.service really is too far from how shine expects the system to be configured, but having an /etc/lnet.conf would be much more flexible than kernel module parameters.

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I think both are doable.

Supporting lnetctl import /etc/lnet.conf is definitely something useful that Shine should support.

Delegating the modules/router supports to external scripts is fine to me, as an optional step. Relying on module_unload=false feature should able to achieve that? We need to update the current patch to disable StartRouter/StopRouter or add additional flags

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pushed https://review.gerrithub.io/c/cea-hpc/shine/+/468899 as a draft, 100% untested code - will work on that tomorrow morning if life allows, but comments on overall architecture are welcome earlier
(EDIT: didn't go for external script but that'd work for me too, happy to change what I started with in that direction)

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