Fix Deb/RPM package build

Fix Deb/RPM package build

This includes simplifying dotnet-deb-tool from a tool package to an ordinary project. This avoids two complications: tool packages used by DotNetCliToolReference can only target .NET Core 2.2 and below, and the Pack requirements are more involved with the new SDK.

Adds some new '<project> -> <artifact>' log lines. It was previously hard to tell what the build was producing; this output clarifies in the usual MSBuild project style.

Commit migrated from https://github.com/dotnet/core-setup/commit/58efb317558e34b805ec8e8650a3b3dcede21fcd