dns-sortlist not recognized in network-config

This bug was originally filed in Launchpad as [LP: #1704402](https://bugs.launchpad.net/cloud-init/+bug/1704402)

Launchpad details

affected_projects = []

assignee = None

assignee_name = None

date_closed = None

date_created = 2017-07-14T14:32:40.942560+00:00

date_fix_committed = None

date_fix_released = None

id = 1704402

importance = undecided

is_complete = False

lp_url = https://bugs.launchpad.net/cloud-init/+bug/1704402

milestone = None

owner = smoser

owner_name = Scott Moser

private = False

status = confirmed

submitter = jfgibbins

submitter_name = James Gibbins

tags = []

duplicates = [1711967]

_Launchpad user **James Gibbins(jfgibbins)** wrote on 2017-07-14T14:32:40.942560+00:00_

I'm using LXD with Ubuntu images, and cloud-init to do initial setup of container. I'm not sure, but I believe the issue is in cloud-init, but would appreciate a pointer to the right location if not. Currently using network-config meta data, cloud-init takes the following config and converts correctly:

version: 1
config:
- type: physical
name: eth0
- type: nameserver
address: ['xx.xx.xx.xx']
search: ['example.local', 'example.org']

However including the following line is not recognized:

sortlist: ['xx.xx.xx.xx', 'xx.xx.xx.xx']

Please add support for this standard nameserver option.