Fix some bugs setting the keyboard layout during installation

When a new layout is set, save it for the desktop usage during the next
boot, I.E the first-boot wizard
Add pc-updatecenter to the build for testing and fix pkg-plist
Merge branch 'master' of github.com:pcbsd/pcbsd
When running the first-boot wizard, prime PCDM with the users
language / keyboard settings for initial login