Fix bug 1030 forcing to wait taskIds

Changelog:
- Fix bug 1030 by Oscar
- Changed comments in configLets according to Itsaso suggestions
- Fix bug in rollback call (modified time to wait in tasks and rollback)

Change-Id: Ib5eadfb44f9d6ff8cd9dbeacc640c925d65d3ea3
Signed-off-by: Francisco Garcia Alvarez <francisco.galvarez@atos.net>