Edited Issue: NuGet.exe restore gives the same warning about prevent from downloading packages during build twice [3566]

Repro steps:
1. create a new MVC3 project
2. nuget.exe restore %pathTo.sln%


Expected: The warning about preventing from downloading packages is only shown once


Actual:

c:\temp>NuGet.exe restore MvcApplication1\MvcApplication1.sln
Restoring NuGet packages...
To prevent NuGet from downloading packages during build, open the Visual Studio
Options dialog, click on the Package Manager node and uncheck 'Allow NuGet to do
wnload missing packages'.
Restoring NuGet packages...
To prevent NuGet from downloading packages during build, open the Visual Studio
Options dialog, click on the Package Manager node and uncheck 'Allow NuGet to do
wnload missing packages'.
Installing 'jQuery 1.7.1.1'.
Installing 'EntityFramework 5.0.0'.
Installing 'jQuery.UI.Combined 1.8.20.1'.
Installing 'jQuery.Validation 1.9.0.1'.
Successfully installed 'jQuery 1.7.1.1'.
Successfully installed 'jQuery.Validation 1.9.0.1'.
Installing 'Microsoft.AspNet.Mvc 3.0.20105.1'.
Successfully installed 'EntityFramework 5.0.0'.
Installing 'Microsoft.AspNet.Providers.Core 1.1'.