[FS#1452] [netifd] gretap instantiation fails on and after commit 1cd76e2 on "master"

[LEDE Bugs]

The following task has a new comment added:

FS#1452 - [netifd] gretap instantiation fails on and after commit 1cd76e2 on "master"
User who did this - Jeff Kletsky (jeffsf)

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Difference between "working" and "non-working" seems to be the call from within ''gre.sh'' that works down to 
ubus -S call network.interface notify_proto { "action": 6, "host": "", "interface": "" }

**On a "bad" build, the ''ubus'' call returns 4**

On a "good" build, the ''ubus'' call returns 0
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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=1452#comment4517