dispatcher: add PRE_UP states
This event runs before a connection/device is announced as "activated" or "connected", to enable scripts to do things before applications begin using connectivity. For example, this could be used to manage /etc/resolv.conf outside of NetworkManager and ensure that resolv.conf had correct information before DNS is used. Note that this is different than the Debian or Gentoo "pre-up" event used in /etc/network/interfaces, as that event runs before any L2 configuration has started. If we really need an event like that, we'll add it later as "lower-up".
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