Removed warnings for packages included in SDK for Net Core 2.0 (#269)

Microsoft.Extensions.SecretManager.Tools
Microsoft.DotNet.Watcher.Tools

For docker containerized apps, avoiding restore again is important for image size

Author: etherealjoy

modules/openapi-generator/src/main/resources/aspnetcore/Project.csproj.mustache

@@ -15,8 +15,6 @@
     <PackageReference Include="Microsoft.EntityFrameworkCore" Version="2.0.2" />
   </ItemGroup>
   <ItemGroup>
-    <DotNetCliToolReference Include="Microsoft.Extensions.SecretManager.Tools" Version="2.0.1" />
     <DotNetCliToolReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Tools" Version="2.0.3" />
-    <DotNetCliToolReference Include="Microsoft.DotNet.Watcher.Tools" Version="2.0.1" />
   </ItemGroup>
 </Project>

samples/server/petstore/aspnetcore/src/Org.OpenAPITools/Org.OpenAPITools.csproj

@@ -15,8 +15,6 @@
     <PackageReference Include="Microsoft.EntityFrameworkCore" Version="2.0.2" />
   </ItemGroup>
   <ItemGroup>
-    <DotNetCliToolReference Include="Microsoft.Extensions.SecretManager.Tools" Version="2.0.1" />
     <DotNetCliToolReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Tools" Version="2.0.3" />
-    <DotNetCliToolReference Include="Microsoft.DotNet.Watcher.Tools" Version="2.0.1" />
   </ItemGroup>
 </Project>