Code review comment for lp:~harlowja/cloud-init/cloud-init-net-refactor

Josh,

Thanks for your work and cleanup on this.
My concerns at the moment are
a.) large churn on code and i need to get something into 16.04 to fix some bugs (bug 1577982, bug 1579130, bug 1577844), so i'd like to hold off on this for that.

b.) if we want 'net' to be standalone then i'd prefer for it to not have 'from cloudinit import...' as that indicates reliance on cloudinit or at least some required conversion before external use. you have experience with this through oslo so i guess i'm fine if there is a sane path forward.

c.) non-standard library usage in 'net'. even if this is just six I will need to support curtin running on Ubuntu 12.04 (python-six at 1.1) for the next 12 months at least.

some nitpicks inline below.