Nvme print flags

[igaw]

I suggest you split the changes into several PRs. There different things which are updated which makes it a bit confusing to review.

So let me give some feedback some quick feedback:

• the first one is fine.
• second one, there are plenty of more places outside of the print code which use enum nvme_print_flags, e.g. in nvme.c. So these users of enum nvme_print_flags need to be updated/reviewed as well. Please as new patch :)
• The reformatting patches: I know you like to get checkpatch clean everything. But it's just a tool which give suggestion IMO. That means we don't have to be 100% clean. Personally I care a lot more about consistency within a file or function. That means if a certain style is used and even if checkpatch complains I leave it. Having different indention strategy within a function looks ugly to me, e.g. Anyway these patches should be a separate PR.
• the fahrenheit command line option. I think we should not introduce a command line option for this and instead just use the locale information.

[ikegami-t]

As already merged split the first patch. Update the PR patch for the second patch only. The reformatting patches and the fahrenheit command line option I will do change and consider separately. Thank you.