RFC: nvme-cli: add "nvme monitor" subcommand

[Martin Wilck]

Dear all,

I've been working on a small daemon for monitoring and acting on 
NVMe discovery-related events. While pondering over various recent
issues, it occured to me that this might be useful:

Currently it handles only AENs and NVME-FC uevents, but it can be
extended to other protocols in the future.

Following the "publish early" principle, I'm posting this here now.
My test results were positive so far.

I've created a github PR with all the details here, please have a look:

https://github.com/linux-nvme/nvme-cli/pull/877

Issues with the CI came up after I submitted this, I'm working on that.

Feedback would be highly appreciated.

Regards,
Martin

-- 
Dr. Martin Wilck <mwilck at suse.com>, Tel. +49 (0)911 74053 2107
SUSE Software Solutions Germany GmbH
HRB 36809, AG Nürnberg GF: Felix Imendörffer