lxc: Introduce lxcNetworkParseDataSuffix
    
    This commit removes the full network entry setting: "lxc.network.X" to
    type only. Like "type", "name", "flags", etc. This will handle entries
    regardless of whether they are prefixed by "lxc.network." (today) or
    "lxc.net.X." (the future).
    
    Signed-off-by: Julio Faracco <jcfaracco@gmail.com>
    Reviewed-by: John Ferlan <jferlan@redhat.com>