AzureRT updates

[hyonholee]

• Expose ComputeImageConfig in Get-AzurePlatformVMImage cmdlet
• Remove hard coded locations in test
• Fix AzureVMAccess test
• Fix Service Management test setup
• Add Set-AzureVMDataDisk cmdlet ARM:Set-AzureDataDisk is missing #694
• Format the output of Get image cmdlets as a table

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[huangpf]

Since this one is in the Lun param set, its position shall be 1 (as for -Name)?

[huangpf]

LGTM, given the data disk concern is addressed.