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
TMK: if we get Vault Settings from portal, then we don't need this.