OC:11146 Create User on windows instance and configure winrm SSL in knife cloud

PBI ref: https://tickets.corp.opscode.com/browse/OC-11146

Implemented changes to configure  winrm ssl by sending Powershell script as a user-data.

knife-cloud exposes create_user_data method which returns PowerShell script to create user and configure winrm ssl . 

@adamedx Please review it.