Fix to missing OS Version in Get-AzureRole

[takekazuomi]

Add OSVersion property.
#1637

[azuresdkci]

Can one of the admins verify this patch?

[azurecla]

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[Vijayaraghavanl]

I also can't see the OS Version!! If and when this starts working would it work for both ASM and ARM?

[takekazuomi]

@Vijayaraghavanl It works only ASM mode. Cloud Service(WebRole and WorkerRole) only available in classics resource and supported by powershell ASM mode only.

[stankovski]

@azuresdkci add to whitelist