"ssh_pwauth" always true on CloudStack datasource with password

This bug was originally filed in Launchpad as [LP: #1747705](https://bugs.launchpad.net/cloud-init/+bug/1747705)

Launchpad details

affected_projects = ['cloud-init (Ubuntu)']

assignee = None

assignee_name = None

date_closed = None

date_created = 2018-02-06T16:15:29.170756+00:00

date_fix_committed = None

date_fix_released = None

id = 1747705

importance = medium

is_complete = False

lp_url = https://bugs.launchpad.net/cloud-init/+bug/1747705

milestone = None

owner = shota-a

owner_name = Shota Aratono

private = False

status = confirmed

submitter = shota-a

submitter_name = Shota Aratono

tags = []

duplicates = []

_Launchpad user **Shota Aratono(shota-a)** wrote on 2018-02-06T16:15:29.170756+00:00_

ssh_pwauth is set forcefully to true when
- Using CloudStack datasource
- Using VM template supports password reset feature.

When cloud-init obtain password from virtual router, cloud-init set ssh_pwauth to true nevertheless originall ssh_pwauth value is No/unchanged.
I read the code and found this behavior is in https://github.com/cloud-init/cloud-init/blob/master/cloudinit/sources/DataSourceCloudStack.py#L148 .

I'd like to use password for only virtual console and forbid ssh password authentication.
The easiest solution is remove the code https://github.com/cloud-init/cloud-init/blob/master/cloudinit/sources/DataSourceCloudStack.py#L150 but I'm not sure about side effect.

How do you think this?
The version of cloud-init is 17.1-46-g7acc9e68-0ubuntu1~16.04.1, on ubuntu 16.04.