Make IsServerEncrypted non-nullable. (#1281)

Fixes https://github.com/Azure/azure-sdk-for-cpp/issues/1202

# Pull Request Checklist

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See the detailed list in the [contributing guide](https://github.com/Azure/azure-sdk-for-cpp/blob/master/CONTRIBUTING.md#pull-requests).

- [x] [C++ Guidelines](https://azure.github.io/azure-sdk/cpp_introduction.html)
- [x] Doxygen docs
- [x] Unit tests
- [x] No unwanted commits/changes
- [x] Descriptive title/description
  - [x] PR is single purpose
  - [x] Related issue listed
- [x] Comments in source
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- [x] Update changelog
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- [x] External references or docs updated
- [x] Self review of PR done
- [x] Any breaking changes?

sdk/storage/azure-storage-files-shares/CHANGELOG.md

@@ -20,6 +20,7 @@
 - Removed `FileRange` and `ClearRange`, they are now represented with `Azure::Core::Http::Range`.
 - Removed `Offset` and `Length` pair in options. They are now represented with `Azure::Core::Http::Range`.
 - Replace scoped enums that don't support bitwise operations with extensible enum.
+- `IsServerEncrypted` member in `DownloadFileToResult`, `UploadFileFromResult`, `FileDownloadResult` and `FileGetPropertiesResult` are no longer nullable.
 
 ## 12.0.0-beta.5 (2020-11-13)
 

sdk/storage/azure-storage-files-shares/inc/azure/storage/files/shares/protocol/share_rest_client.hpp

@@ -782,7 +782,7 @@ namespace Azure { namespace Storage { namespace Files { namespace Shares {
       Azure::Core::Nullable<std::string> CopyProgress;
       Azure::Core::Nullable<std::string> CopySource;
       Azure::Core::Nullable<CopyStatusType> CopyStatus;
-      Azure::Core::Nullable<bool> IsServerEncrypted;
+      bool IsServerEncrypted = bool();
       std::string FileAttributes;
       Core::DateTime FileCreatedOn;
       Core::DateTime FileLastWrittenOn;
@@ -809,7 +809,7 @@ namespace Azure { namespace Storage { namespace Files { namespace Shares {
       Azure::Core::Nullable<std::string> CopyProgress;
       Azure::Core::Nullable<std::string> CopySource;
       Azure::Core::Nullable<CopyStatusType> CopyStatus;
-      Azure::Core::Nullable<bool> IsServerEncrypted;
+      bool IsServerEncrypted = bool();
       std::string FileAttributes;
       Core::DateTime FileCreatedOn;
       Core::DateTime FileLastWrittenOn;

sdk/storage/azure-storage-files-shares/inc/azure/storage/files/shares/share_responses.hpp

@@ -118,7 +118,7 @@ namespace Azure { namespace Storage { namespace Files { namespace Shares { names
     int64_t ContentLength = 0;
     ShareFileHttpHeaders HttpHeaders;
     Storage::Metadata Metadata;
-    Azure::Core::Nullable<bool> IsServerEncrypted;
+    bool IsServerEncrypted = false;
   };
 
   struct ForceCloseFileHandleResult
@@ -127,7 +127,7 @@ namespace Azure { namespace Storage { namespace Files { namespace Shares { names
 
   struct UploadFileFromResult
   {
-    Azure::Core::Nullable<bool> IsServerEncrypted;
+    bool IsServerEncrypted = false;
   };
 
 }}}}} // namespace Azure::Storage::Files::Shares::Models