keyfile: write in-memory connections to /run
This is useful for in-memory connections to persist NetworkManager restarts (as opposed to machine restarts). Perhaps most improtantly, this allows generating in-memory connections outside NetworkManager, e.g. passing configuration from early boot firmware in initrd. Note that this does *not* aspire to do more than it says on the tin: Notably, it doesn't touch the problem of provisioning connections in multiple persistent connection directories and thus doesn't have to deal with the problem of deleting or overlaying the connections tha (rh #772414) deals with.
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