Sanitize input for properties that are lists

[DeepakRajendranMsft]

1. Fixing output for resources.
   If a resource was used as a reference and it had a property which was a list then we would print an empty list.
2. Created a base class for all LB inbound rules

[azurecla]

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[hovsepm]

on-demand: http://azuresdkci.cloudapp.net/view/1-AzurePowerShell/job/powershell-demand/428/