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Revert "Python/ifconfig: T1712: wait when changing interface state"

Description

Revert "Python/ifconfig: T1712: wait when changing interface state"

This reverts commit 1257d7851866d42287018b38dd871f279b87286a.

It will delay network interface configuration everywhere when e.g. no network
cable is plugged in. We should find the root cause why DHCPd sometimes did not
start.