SLA tracking command signals ended process or nodes

The command does not take into account the status of the process/node is signaling
causing to signal every process/node that has ever happened in the db.

https://github.com/kiegroup/jbpm/blob/master/jbpm-services/jbpm-executor/src/main/java/org/jbpm/executor/commands/SLATrackingCommand.java