Include netbase Ubuntu package in images

[AlexHill]

What docker image(s) is this feature applicable to?

base-notebook, docker-stacks-foundation, minimal-notebook

What change(s) are you proposing?

Add the netbase Ubuntu package to images.

How does this affect the user?

This package provides the necessary infrastructure for basic TCP/IP based networking.
In particular, it supplies common name-to-number mappings in /etc/services, /etc/rpc, /etc/protocols and /etc/ethertypes

/etc/protocols is part of the POSIX spec and required by the C functions getprotobyname and getprotobynumber. Some reading here: https://unix.stackexchange.com/questions/680494/what-is-the-significance-of-etc-protocols-in-linux

Anything else?

If this proposal is accepted, it's as easy as adding netbase to an apt-get install somewhere in the chain of images.

[mathbunnyru]

@AlexHill could you please create a PR and then I will create a vote there?

[AlexHill]

Done, thanks