This creates 3 new build outputs:
* aspnetcore-targeting-pack-$(version).tar.gz
* aspnetcore-targeting-pack-$(version)-linux-x64.deb
* aspnetcore-targeting-pack-$(version)-linux-x64.rpm
Other changes:
* Make RPM packaging consistent with other installers. Vendor == Microsoft Corporation
* Add shared properties for building the targeting pack (or not building it in a servicing build)
- aspnet/AspNetCore-Internal#1735
- port aspnet/Extensions@e2bb8ac1a0 fix into this repo
- change `default-build.yml` instead of `azure-pipelines.yml`
- make a couple of changes to `KillProcesses.ps1` (which I'll take back to Extensions)
- remove `ci-official.yml`