Importing, displaying Vault settings, framework for Gets

This change set includes Importing vault settings and displaying the same and getting list of cloud services. Also framework for GETs is ready.

Import cmdlet allows piping, example usage is here:
PS C:\> $resourceName = "resourceName"
PS C:\> $cloudServiceName = "cloudServiceName"
	
PS C:\> Get-AzureSiteRecoveryVaultSettingFile -ResourceName $resourceName -CloudSeriveName $cloudServiceName | Import-AzureSiteRecoveryVaultSetting
We seem to be adding site recovery specific properties into a global data structure (AzureSubscriptionData). I feel you may get push back in your CR. There is also the risk that we may regress someone else.

Do we not have a design where we don't have to change global data structures? (i.e. only add our own structures - but not make change in global ones)