See CR 6709081: 6u11 installer should not patch 6u10-beta releases
Steps to reproduce:
1. Install 6u10-beta
2. Install 6u11-fcs
3. It will try and patch the 6u10-beta jre image, but it will get a patcher error (because it's expecting 6u10-fcs)
We'll need some way of detecting if an installed release is non-fcs, and tell the user to uninstall it before upgrading.