[Service Bus] Sample needed for Dead Letter Queues

[ramya-rao-a]

The doc Overview of dead letter queues links to a sample that uses the older .NET package WindowsAzure.ServiceBus

Ideally, there should be links to samples that use packages from all languages. This issue is to add a corresponding sample that uses the azure-messaging-servicebus package so that it can be linked appropriately.

Reference: DeadletterQueue

Adding this sample will also be useful for us to re-direct readers who land at the above sample.

cc @spelluru

[v-hongli1]

@ramya-rao-a - After investigation, I found that the DeadletterQueue sample about java already exists, but the package it uses is com-microsoft-azure-servicebus.
So I think there are two ways to change:

1. Based on the original sample, update com-microsoft-azure-servicebus package to azure-messaging-servicebus package.
2. Add a new DeadletterQueue sample using the azure-messaging-servicebus package, whose package directory is com.azure.servicebus.samples.deadletterqueue

Which one do you think is more appropriate? If you have better suggestions, please tell me, thanks!

[ramya-rao-a]

We need a copy of the Java DeadletterQueue sample you found that uses the newer package azure-messaging-servicebus. This should live in https://github.com/Azure/azure-sdk-for-java/tree/master/sdk/servicebus/azure-messaging-servicebus/src/samples