[FS#180] Broken the Tunnelbroker endpoint update

[LEDE Bugs]

The following task has a new comment added:

FS#180 - Broken the Tunnelbroker endpoint update 
User who did this - john (john)

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BB/CC used this URL format

local url="http://ipv4.tunnelbroker.net/ipv4_end.php?ip=AUTO&apikey=$username&pass=$password&tid=$tunnelid"

this was changed to 

local url="$http://ipv4.tunnelbroker.net/nic/update?hostname=$tunnelid"  with uid/pwd passed using BASIC_AUTH additionally you can not use the password anymore but need to use the new update key for it to work properly. after chanhing my setup to use update_key instead of password it worked again.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=180#comment449