Support upgrade for ASDK.

It is just not realistic for developers to rebuild ASDK each time when there is a new build. Microsoft should allow the upgrade of ASDK just like the integrated system. It is just like SQL Developer edition vs Enterprise edition, all features and upgrade are supported in the same way, just Developer edition is for dev/test.

When we rebuild the ASDK for evaluation, not only do we have to re-deploy the ASDK, but also re-build all POC scenarios as well, it could be weeks of effort.