Support newer v5 nickel usb gadget name kobo

[NerdyProjects]

More recent v5 firmware renamed the usb_gadget from g1 to kobo. accept this in USBMS.

• handle new usb_gadget handling for nickel support
• handle swapfile on /mnt/onboard

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This change is 

[NerdyProjects]

original firmware does swapoff -a before unmounting /mnt/onboard now, that does the trick.

I am duplicating infos between here and koreader/koreader#12401

[Frenzie]

Fine by me, but of course this is @NiLuJe's thing.

[NerdyProjects]

@NiLuJe this works now.

Original firmware has a new /etc/init.d/usb-gadget (attached as usb-gadget.sh)
usb-gadget.sh

It might be that we don't need to fiddle with usb gadget config at all now, but i went the safe way keeping existing reconfiguration and restoring to nickel-defaults.

What do you say?

[NiLuJe]

A few questions, a few minor style nits, but the only real issue I can see is with the stock script call ;).

[NiLuJe]

What do you say?

We have a long & fun history with the stock Nickel USBMS doing weird and broken things, so, yeah, I'd rather avoid it, even if it is much saner than it used to ;).

[NerdyProjects]

What do you say?

We have a long & fun history with the stock Nickel USBMS doing weird and broken things, so, yeah, I'd rather avoid it, even if it is much saner than it used to ;).

Sorry I didn't understand: What exactly to avoid? Like: Is there something I should change from this state?

[NiLuJe]

What do you say?

We have a long & fun history with the stock Nickel USBMS doing weird and broken things, so, yeah, I'd rather avoid it, even if it is much saner than it used to ;).

Sorry I didn't understand: What exactly to avoid? Like: Is there something I should change from this state?

Yeah, sorry, not enough context in my answer ;).

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Given the latest inline discussion, that's fine, I'd just add the comment about Nickel's new expectations of the gadget being setup.

[NerdyProjects]

I did that, so that should be good to go :-)

[NerdyProjects]

Let me ping you @NiLuJe again as you asked so :D Anything more I should change before this is good to go?

[NiLuJe]

No, this looks pretty good, sorry ;).

I'm just under a couple of deadlines right now, I should be able to button this up next week-end or so ;)

[NerdyProjects]

Should I ping you regurlarly @NiLuJe or is it stressing? :)

[NiLuJe]

Nope, good idea, this had completely skipped my mind ;p.

I should have more time in a couple of weeks, FWIW, sorry about that ;).