[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 - Pavlo Rudyi (paulcarroty)

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https://dev.openwrt.org/ticket/15054#comment:6

Seems like HE now have a new API: 

https://username:pass@ipv4.tunnelbroker.net/nic/update?hostname=id

local url="$http://$username:$password_OR_$UPDATEKEY@ipv4.tunnelbroker.net/nic/update?hostname=$tunnelid"
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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#comment444