This should ensure that handles for active tasks will always be available, and for a while after completion, whilst preventing copytrans handles from accumulating in memory forever.
1. Perform a big copytrans which consumes more than 1 hours (e.g. gcc).
2. After 1 hour, log in as admin
3. Administration page -> Process Manager
4. Test passes if the copytrans task is still there.
VERIFIED with Zanata 3.4.2-SNAPSHOT (git-server-3.4.1-50-gf1b0828)