Website projects hosted in IIS should not cause restore to fail

[emgarten]

Between 3.3.0 and 3.4.0 NuGet started checking the full path of solution file entries, for websites with http URIs this fails.

Repro solution file:

Microsoft Visual Studio Solution File, Format Version 12.00
# Visual Studio 2013
VisualStudioVersion = 12.0.40629.0
MinimumVisualStudioVersion = 10.0.40219.1
Project("{E24C65DC-7377-472B-9ABA-BC803B73C61A}") = "ClientTests(27)", "http://localhost:51302", "{58EB0990-1F4C-4F10-ABF3-066AD74BE891}"
EndProject

Results from each version of NuGet
2.8.6 Warning displayed, no failure

D:\tmp\nuget.2.8.6.exe restore
WARNING: Project file C:\Users\juste\Documents\Visual Studio 2015\Projects\websites2\http://localhost:51302 cannot be found.
All packages listed in packages.config are already installed.

3.3.0 No warning, no failure

D:\tmp\nuget.3.3.0.exe restore
MSBuild auto-detection: using msbuild version '14.0' from 'C:\Program Files (x86)\MSBuild\14.0\bin'.
All packages listed in packages.config are already installed.

3.5.0 failure

D:\tmp\release-3.5.0-beta2\1520\artifacts\NuGet.exe restore -verbosity detailed
NuGet Version: 3.5.0.1520
Restoring NuGet packages for solution D:\tmp\websites\test.sln.
MSBuild auto-detection: using msbuild version '14.0' from 'C:\Program Files (x86)\MSBuild\14.0\bin'. Use option -MSBuildVersion to force nuget to use a specific version of MSBuild.
System.AggregateException: One or more errors occurred. ---> System.NotSupportedException: The given path's format is not supported.
   at System.Security.Permissions.FileIOPermission.QuickDemand(FileIOPermissionAccess access, String fullPath, Boolean checkForDuplicates, Boolean needFullPath)
   at System.IO.Path.GetFullPath(String path)
   at System.Linq.Enumerable.<>c__DisplayClass7_0`3.<CombineSelectors>b__0(TSource x)
   at System.Linq.Enumerable.WhereSelectListIterator`2.MoveNext()
   at NuGet.CommandLine.RestoreCommand.ProcessSolutionFile(String solutionFileFullPath, PackageRestoreInputs restoreInputs)
   at NuGet.CommandLine.RestoreCommand.GetInputsFromDirectory(String directory, PackageRestoreInputs packageRestoreInputs)
   at NuGet.CommandLine.RestoreCommand.DetermineRestoreInputs()
   at NuGet.CommandLine.RestoreCommand.<ExecuteCommandAsync>d__23.MoveNext()
   --- End of inner exception stack trace ---
   at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
   at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
   at NuGet.CommandLine.Command.Execute()
   at NuGet.CommandLine.Program.MainCore(String workingDirectory, String[] args)
---> (Inner Exception #0) System.NotSupportedException: The given path's format is not supported.
   at System.Security.Permissions.FileIOPermission.QuickDemand(FileIOPermissionAccess access, String fullPath, Boolean checkForDuplicates, Boolean needFullPath)
   at System.IO.Path.GetFullPath(String path)
   at System.Linq.Enumerable.<>c__DisplayClass7_0`3.<CombineSelectors>b__0(TSource x)
   at System.Linq.Enumerable.WhereSelectListIterator`2.MoveNext()
   at NuGet.CommandLine.RestoreCommand.ProcessSolutionFile(String solutionFileFullPath, PackageRestoreInputs restoreInputs)
   at NuGet.CommandLine.RestoreCommand.GetInputsFromDirectory(String directory, PackageRestoreInputs packageRestoreInputs)
   at NuGet.CommandLine.RestoreCommand.DetermineRestoreInputs()
   at NuGet.CommandLine.RestoreCommand.<ExecuteCommandAsync>d__23.MoveNext()<---