MDNS hostname match DHCP. Fix collision mangling

[tannewt]

MDNS defaults to the hostname used by DHCP/LWIP since it is now unique. This makes it the same either way.

This also updates esp-protocols (used for mdns) with a patch to ensure that mangled names are the ones that collide. (circuitpython.local collides but was causing cpy- to be mangled.)

Fixes #6869 again.

@RetiredWizard this changes the hostname slightly because it hit an assert when over 32 characters. cpy, board and mac are now dash separated too. That way the board's _ don't confusing things.

@anecdata Please test this for the MDNS collision mangling. I just checked that MDNS still works.

[dhalbert]

This looks fine to me but we can await testing by @anecdata and @RetiredWizard as well.

[tannewt]

It should be fine in a beta too. I tested that MDNS still works.

[dhalbert]

Merging and can be tested in the beta.

[anecdata]

I'm getting the same hostname / mdns hostname for all four devices I set up: cpy-t_qtpy_esp32s2-3ffe2e90, despite unique MAC addresses.

(curl finds them all, but oddly only sometimes gets the redirect:
Location: http://cpy-t_qtpy_esp32s2-3ffe2e90.local/
other times it goes directly from circuitpython.local to the IP address --> huh, with a FQDN circuitpython.local. it does not redirect through the cpy name, with circuitpython.local it does redirect through the cpy` name ...saves a good bit of time to not have an additional redirect)

[RetiredWizard]

Tested on BPI PIcow S3 and Hacktablet, the Web workflow page and my DHCP server both show the expected hostname with the correct 😊 MAC address.

[anecdata]

Looks good, no mangling observed. mdns hostname correctly shows each MAC address. WW pages load with curl or browser by IP, mdns hostname, or circuitpython.local[.]

Links to other devices on the WW pages are correct.

[dhalbert]

Thanks @anecdata and @RetiredWizard for testing!

There is some build problem with the latex pdf doc build. I am going to ignore that for now and debug it separately. I will go ahead and merge this.