Resolving Microsoft.Azure.Management.Storage version conflicts for Sql tests.

Author: MiYanni

src/ResourceManager/Sql/Commands.Sql.Test/Commands.Sql.Test.Netcore.csproj

@@ -26,6 +26,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.Azure.Management.Sql" Version="1.18.0-preview" />
     <PackageReference Include="Microsoft.Azure.Management.Network" Version="19.3.0-preview" />
+    <PackageReference Include="Microsoft.Azure.Management.Storage" Version="8.1.0-preview" />
     <PackageReference Include="Microsoft.Azure.Graph.RBAC" Version="3.2.0-preview" />
   </ItemGroup>