[REFACTOR] Converted enum values to "all uppercase"

According to the Java conventions the names of constants should only
consist of uppercase characters and underscores. Some enum values
violated this convention.

Change-Id: I105e2b92cee04fb1754305726c68f39bec0e8a88
Reviewed-on: http://saros-build.imp.fu-berlin.de/gerrit/860
Tested-by: Jenkins CI
Reviewed-by: Patrick Schlott <pschlottk@gmail.com>
Reviewed-by: Stefan Rossbach <srossbach@arcor.de>