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ppp: prevent commits on interface while IPCP/IPV6CP is running

Beniamino Galvani requested to merge bg/ppp-race-rh2085382 into main

pppd also tries to configure addresses by itself, and quits if it fails to do so. If we commit addresses on the device at the same time, we might race with pppd. So, we are not allowed to touch the device until pppd sends us an IP configuration, which happens after it has finished configuring the interface.

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