Addint Test cases for bugs (TFS ids)
1464473 -> Hide OSImage and VMImage properties in Get-AzureVMImage
1472873 -> Deserializing an empty public config on Get-AzureVMCustomScriptExtension throws a value is null error
1427420 -> Stop Get-AzureVMAccessExtension displaying user password in plain text
1290257 -> Enable BGInfo by default when creating a VM with GA enabled
1431959 -> Cannot create password-less Linux VM with New-AzureVM
Merge branch 'dev' of https://github.com/AzureRT/azure-sdk-tools into dev

Conflicts:
	WindowsAzurePowershell/src/Commands.ServiceManagement.Test/FunctionalTests/ExtensionTests/AzureVMAccessExtensionTests.cs
	WindowsAzurePowershell/src/Commands.ServiceManagement.Test/FunctionalTests/ExtensionTests/CustomScriptExtesnionTests.cs
	WindowsAzurePowershell/src/Commands.ServiceManagement.Test/FunctionalTests/ServiceManagementCmdletTestHelper.cs
Addint Test cases for bugs (TFS ids) 1464473,1472873,1427420,1290257,1431959
Removed commented lines from AzureVMBGInfoExtensionTests.cs
Merge pull request #93 from v-didara/dev

Addint Test cases for bugs (TFS ids) 1464473,1472873,1427420,1290257,1431959