Add Weave CNI To K3D

General MR

Summary

Adds in the ability to choose the Weave CNI when running the k3d-dev.sh script. This helps with large installs.

The changes will also always install to a bridge on the 172.20.0.0/16 subnet. This makes each install -- metallb or not-- consistent on each (re)install.

This work done here is part of Epic 238 and helps resolve Pipeline Templates issue 71

Relevant logs/screenshots

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