Prepare for SB release (Azure#18486)

* Prepare for SB release

* Update version

sdk/servicebus/Azure.Messaging.ServiceBus/CHANGELOG.md

@@ -1,16 +1,19 @@
 # Release History
 
-## 7.1.0-beta.1 (Unreleased)
+## 7.1.0 (2021-02-09)
 
 ### Acknowledgments
 Thank you to our developer community members who helped to make the Service Bus client library better with their contributions to this release:
 
 - Aaron Dandy _([GitHub](https://github.com/aarondandy))_
 
-### Key Bug Fixes
+### Added
+- Added virtual keyword to all client properties to enable mocking scenarios.
+- Added `ServiceBusModelFactory.ServiceBusMessageBatch` to allow mocking a `ServiceBusMessageBatch`.
 
+### Key Bug Fixes
 - Fixed an issue with the `ServiceBusProcessor` where closing and disposing or disposing multiple times resulted in an exception.  (A community contribution, courtesy of _[aarondandy](https://github.com/aarondandy)_)
-
+- Fixed issue with batch size calculation when using `ServiceBusMessageBatch`.
 
 ## 7.0.1 (2021-01-12)
 

sdk/servicebus/Azure.Messaging.ServiceBus/src/Azure.Messaging.ServiceBus.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <Description>Azure Service Bus is a fully managed enterprise integration message broker. Service Bus can decouple applications and services. Service Bus offers a reliable and secure platform for asynchronous transfer of data and state. This client library allows for both sending and receiving messages using Azure Service Bus. For more information about Service Bus, see https://docs.microsoft.com/en-us/azure/service-bus-messaging/service-bus-messaging-overview</Description>
-    <Version>7.1.0-beta.1</Version>
+    <Version>7.1.0</Version>
     <ApiCompatVersion>7.0.1</ApiCompatVersion>
     <PackageTags>Azure;Service Bus;ServiceBus;.NET;AMQP;$(PackageCommonTags)</PackageTags>
     <TargetFrameworks>$(RequiredTargetFrameworks)</TargetFrameworks>