Fix casing of package IDs in lockfile

[ChengTian]

#581

Current dnu restore behavior is:
When restoring a package with wrong id casing, for example restoring package XYZ.1.0.0 by having "xyz": "1.0.0" in project.json, it shows Unable to resolve xyz.1.0.0, do you mean XYZ.1.0.0? and doesn't install the package.
It prevents users from using some NuGet packages (see cases below).

New behavior should be:
Instead of exiting with error message above, we install the package to .dnx/xyz/1.0.0 and make sure the casing of package name in lockfile is correct (xyz). This should fix the cases below.

Basically, we always agree on the casing used by dependency graph.

[davidfowl]

{
    "version": "1.0.0-*",
    "dependencies": {
        "NuGet.Core": "2.8.3"
    },
    "frameworks": {
        "dnx451": { },
        "dnxcore50": { }
    }
}

Results in

Information: [LoaderContainer]: Load name=Microsoft.Framework.PackageManager
Information: [PathBasedAssemblyLoader]: Loaded name=Microsoft.Framework.PackageManager in 61ms
Restoring packages for C:\Users\davifowl\documents\visual studio 14\Projects\WebApplication25\src\WebApplication1\project.json
  CACHE https://nuget.org/api/v2/FindPackagesById()?Id='NuGet.Core'
  CACHE https://www.myget.org/F/aspnetvolatile/api/v2/FindPackagesById()?Id='NuGet.Core'
  CACHE https://www.nuget.org/api/v2/package/Nuget.Core/2.8.3
  CACHE https://nuget.org/api/v2/FindPackagesById()?Id='Microsoft.Web.Xdt'
  CACHE https://www.myget.org/F/aspnetvolatile/api/v2/FindPackagesById()?Id='Microsoft.Web.Xdt'
Unable to locate NuGet.Core >= 2.8.3. Do you mean Nuget.Core?
Writing lock file C:\Users\davifowl\documents\visual studio 14\Projects\WebApplication25\src\WebApplication1\project.lock.json
Restore complete, 241ms elapsed
Errors in C:\Users\davifowl\documents\visual studio 14\Projects\WebApplication25\src\WebApplication1\project.json
    Unable to locate NuGet.Core >= 2.8.3. Do you mean Nuget.Core?
Loaded Module: dnx.clr.dll
Found DLL Export: CallApplicationMain

[davidfowl]

Seems innocent at first, but when it happens via a transitive dependency:

{
    "version": "1.0.0-*",
    "dependencies": {
        "NuGet.Indexing": "3.0.75-r-master"
    },
    "frameworks": {
        "dnx451": { },
        "dnxcore50": { }
    }
}

Writing lock file C:\Users\davifowl\documents\visual studio 14\Projects\WebApplication25\src\WebApplication1\project.lock.json
Restore complete, 14741ms elapsed
Errors in C:\Users\davifowl\documents\visual studio 14\Projects\WebApplication25\src\WebApplication1\project.json
    Unable to locate NuGet.Core >= 2.8.3-alpha0001. Do you mean Nuget.Core?
Loaded Module: dnx.clr.dll
Found DLL Export: CallApplicationMain

This is because some nuspec way down the chain says Nuget.Core and this harder to fix:

{
    "version": "1.0.0-*",
    "dependencies": {
        "Nuget.Core": "2.8.3",
        "NuGet.Indexing": "3.0.75-r-master"
    },
    "frameworks": {
        "dnx451": { },
        "dnxcore50": { }
    }
}

Information: [LoaderContainer]: Load name=Microsoft.Framework.PackageManager
Information: [PathBasedAssemblyLoader]: Loaded name=Microsoft.Framework.PackageManager in 56ms
Restoring packages for C:\Users\davifowl\documents\visual studio 14\Projects\WebApplication25\src\WebApplication1\project.json
  CACHE https://nuget.org/api/v2/FindPackagesById()?Id='Microsoft.Web.Xdt'
  CACHE https://www.myget.org/F/aspnetvolatile/api/v2/FindPackagesById()?Id='Microsoft.Web.Xdt'
  CACHE https://nuget.org/api/v2/FindPackagesById()?Id='System.Spatial'
  CACHE https://www.myget.org/F/aspnetvolatile/api/v2/FindPackagesById()?Id='System.Spatial'
  CACHE https://www.nuget.org/api/v2/package/System.Spatial/5.2.0
  CACHE https://nuget.org/api/v2/FindPackagesById()?Id='WindowsAzure.Storage'
  CACHE https://www.myget.org/F/aspnetvolatile/api/v2/FindPackagesById()?Id='WindowsAzure.Storage'
  CACHE https://www.nuget.org/api/v2/package/WindowsAzure.Storage/2.0.5.1
  CACHE https://nuget.org/api/v2/FindPackagesById()?Id='NuGet.Core'
  CACHE https://www.myget.org/F/aspnetvolatile/api/v2/FindPackagesById()?Id='NuGet.Core'
  CACHE https://www.nuget.org/api/v2/package/Nuget.Core/2.8.3-alpha0001
Writing lock file C:\Users\davifowl\documents\visual studio 14\Projects\WebApplication25\src\WebApplication1\project.lock.json
Restore complete, 1095ms elapsed
Loaded Module: dnx.clr.dll
Found DLL Export: CallApplicationMain

Nearest wins makes it work, but if packages end up having mixed casing in the same dependency tree, it might get confusing quickly.

[davidfowl]

Another test case:

{
    "version": "1.0.0-*",
    "dependencies": {
        "HangFire": "1.3.0"
    },

    "frameworks" : {
        "dnx451" : { 
            "dependencies": {
            }
        }
    }
}

Information: [LoaderContainer]: Load name=Microsoft.Framework.PackageManager
Information: [PathBasedAssemblyLoader]: Loaded name=Microsoft.Framework.PackageManager in 93ms
Restoring packages for c:\users\davifowl\documents\visual studio 14\Projects\ClassLibrary58\src\ClassLibrary58\project.json
  CACHE https://nuget.org/api/v2/FindPackagesById()?Id='Hangfire.Core'
  CACHE https://www.nuget.org/api/v2/package/HangFire.Core/1.3.0
  CACHE https://nuget.org/api/v2/FindPackagesById()?Id='Hangfire.SqlServer'
  CACHE https://www.nuget.org/api/v2/package/HangFire.SqlServer/1.3.0
  CACHE https://nuget.org/api/v2/FindPackagesById()?Id='Newtonsoft.Json'
Unable to locate Hangfire.SqlServer >= 1.3.0<= 1.3.0. Do you mean HangFire.SqlServer?
Unable to locate Hangfire.Core >= 1.3.0<= 1.3.0. Do you mean HangFire.Core?
Writing lock file c:\users\davifowl\documents\visual studio 14\Projects\ClassLibrary58\src\ClassLibrary58\project.lock.json
Restore complete, 732ms elapsed
Errors in c:\users\davifowl\documents\visual studio 14\Projects\ClassLibrary58\src\ClassLibrary58\project.json
    Unable to locate Hangfire.SqlServer >= 1.3.0<= 1.3.0. Do you mean HangFire.SqlServer?
    Unable to locate Hangfire.Core >= 1.3.0<= 1.3.0. Do you mean HangFire.Core?
Loaded Module: dnx.clr.dll
Found DLL Export: CallApplicationMain

[ChengTian]

great, will test my fix against all of those cases