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This locks NM into dhcpcd-9.3.3 as that is the first version to support the --noconfigure option. Older versions are no longer supported by NM because they do modify the host which is undesirable. Due to the way dhcpcd-9 uses privilege separation and that it re-parents itself to PID 1, the main process cannot be reaped or waited for. So we rely on dhcpcd correctly cleaning up after itself. A new function nm_dhcp_client_stop_watch_child() has been added so that dhcpcd can perform similar cleanup to the equivalent stop call. As part of this change, the STOP and STOPPED reasons are mapped to NM_DHCP_STATE_DONE and PREINIT is mapped to a new state NM_DHCP_STATE_NOOP which means NM should just ignore this state. NetworkManager/NetworkManager!668
