_HandlePackageFileConflicts reports conflicts for satellite assemblies

[AArnott]

git clone https://devdiv.visualstudio.com/DefaultCollection/DevDiv/_git/VSIDEConEx.IdentityService
cd VSIDEConEx.IdentityService
git co 67aa3553c0741f8f44195a6b71ab87b5fadf953f
.\init
cd src\IdentityService
msbuild /v:normal

Expected
Few or no build warnings

Actual
Hundreds of warnings about copy local conflicts from the _HandlePackageFileConflicts target, such as:

Encountered conflict between 'CopyLocal:C:\Users\andarno.nuget\packages\microsoft.visualstudio.threading\15.3.20\lib\net45\cs\Microsoft.VisualStudio.Threading.resources.dll' and 'CopyLocal:C:\Users\andarno.nuget\packages\microsoft.visualstudio.threading\15.3.20\lib\net45\ru\Microsoft.VisualStudio.Threading.resources.dll'. Could not determine winner due to equal file and assembly versions.

Note the warnings are regarding two satellite assemblies with different cultures. There should be no conflict here, since they should be copied locally to their own culture-specific subfolders.

[nguerrera]

Duplicate of #1465. These are high importance messages, not warnings right?

[AArnott]

Yes, I suppose so. Thanks.