Improvement suggestion - Validate fields like username and password

[faister]

I created the DSVM from https://portal.azure.com/#create/Microsoft.Template/uri/https%3A%2F%2Fraw.githubusercontent.com%2FAzure%2FDataScienceVM%2Fmaster%2FExtensions%2FIoTEdge%2Fazuredeploy.json a couple times but upon VM deployment, I could not authenticate my SSH session with the following error:
Permission denied (publickey,password)

Then I realised that there is a new username requirement for Linux VMs on Azure which requires that the string must be at least 8 characters long. I used the standard "azureuser" and it works.

Improvement suggestion - please validate fields in https://portal.azure.com/#create/Microsoft.Template/uri/https%3A%2F%2Fraw.githubusercontent.com%2FAzure%2FDataScienceVM%2Fmaster%2FExtensions%2FIoTEdge%2Fazuredeploy.json