Added tests for TicketOwnerSet(), added tests for ChangeBy and CreateBy attributes that are now returned by TicketGet().
Added tests for TicketOwnerSet(), added tests for ChangeBy and CreateBy attributes that are now returned by TicketGet().

djoudi/otrs-gitimport-test,djoudi/otrs-gitimport-test,djoudi/otrs-gitimport-test