libvirt: set firewall backend priority

If firewall_backend isn't configured in the config file, libvirt will
choose the first available backend from the following list by default:

    [nftables, iptables]

so when nftables is installed in image, firewall backend nftables rather
than iptables is adopted.

Add a PACKAGECONFIG to set the firewall backend priority. And update
runtime dependencies for backend nftables.

Signed-off-by: Kai Kang <kai.kang@windriver.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>

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