[FS#1247] BT Home Hub 5A fails to connect PPPOE over DSL

[LEDE Bugs]

The following task has a new comment added:

FS#1247 - BT Home Hub 5A fails to connect PPPOE over DSL 
User who did this - Mathias Kresin (mkresin)

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It seems to me that the mentioned commit brought back a well known race condition.

Mauro, are you able to test a quick hack? I would like to ensure that I'm turning the correct knob before investing more time.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=1247#comment4082