TGT shouldn't have multiple ST for the same service

A Ticket-Granting Ticket should not have multiple Service Tickets for
the same service. This ensures we don't create tons of Service Tickets
in case of a redirect loop or other client-side configuration issues.
Ensure cleanup task is not executed multiple times in parallel
Fix some leftovers and long index names
Service can actually be longer than 255 characters
Merge pull request #25 from rbCAS/fix-service-length

Service can actually be longer than 255 characters
Merge pull request #24 from rbCAS/fix-indexes

Fix some leftovers and long index names
Merge pull request #23 from rbCAS/lock-cleanup

Ensure cleanup task is not executed multiple times in parallel
Merge pull request #22 from rbCAS/only-one-service-ticket-per-service

TGT shouldn't have multiple ST for the same service
Remove deprecated upgrade instructions [ci skip]
Merge branch 'master' into release/2.0