Add netbase to minimal images

The iptables-basic tests expect a specific list of iptables rules to be present on the target. Depending on whether netbase is installed or not, the formatting of this list changes, when installed protocols are listed by name and by number when it's not. The iptables --numeric option can not be used with the --list-rules option.

The simplest way to resolve this is to ensure consistent output across all image types by installing netbase on minimal images.

It appears netbase would have been installed into minimal images prior to the ospack types being split into different debos configurations.

Signed-off-by: Martyn Welch martyn.welch@collabora.com