windowshosting package may depend on incorrect runtimepackagestore version

[jberezanski]

Scenario:

1. aspnetcore-runtimepackagestore is forcibly updated and gets a package fix version, e.g. 2.1.0.20180531
2. dotnetcore-windowshosting is also forcibly updated and gets the same package fix version, e.g. 2.1.0.20180531
3. dotnetcore-windowshosting AU script runs au_GetLatest from aspnetcore-runtimepackagestore to determine the appropriate dependency version to use
4. au_GetLatest from aspnetcore-runtimepackagestore correctly returns 2.1.0, because that is the actual latest released software version
5. result: dotnetcore-windowshosting 2.1.0.20180531 depends on aspnetcore-runtimepackagestore 2.1.0 instead of 2.1.0.20180531

I believe the correct way to handle this would be to:

1. in UpdateAll.ps1, ensure aspnetcore-runtimepackagestore is processed earlier than dotnetcore-windowshosting,
2. in dotnetcore-windowshosting AU script, obtain the latest aspnetcore-runtimepackagestore version from the aspnetcore-runtimepackagestore stream json state file instead of invoking au_GetLatest from that package.