lxc: Introduce lxcNetworkParseDataEntry
    
    Refactor lxcNetworkWalkCallback to be a simple method to handle
    both possible network settings with indexes or the simple one. It is
    better the decouple the whole algorithm to parse data to only parse
    which entry type libvirt is handling.
    
    The new method is responsible to verify is the settings correspond to
    network entry. Right now, it is only verifying "lxc.network.", but in
    the future, it can be used to verify "lxc.net.X." too. Any other case
    would be rejected.
    
    On the other hand, the idea here is working only with types. If we know
    that entry is part of network settings, after we just need to know which
    type is. It keeps the handler simple.
    
    Signed-off-by: Julio Faracco <jcfaracco@gmail.com>
    Reviewed-by: John Ferlan <jferlan@redhat.com>