[GSS] (7.z) Runaway of the reassignment timer if the value "Expires At" is at 0

If a reassignment timer has as value 0 for "expiresAt", the creation of timers in the JBOSS_EJB_TIMER table has the following behaviour:

• if "expiresAt" = 6d ==> creation of a single timer to reassign the task
• if "expiresAt" = 0  ==> creation of an infinity of timers to reassign the task

The case "expiresAt" = 0 leads to the definitive blocking of the timer engine.