fix(Orchestrator): Gracefully catch exceptions from Synchronize step

[Hipska]

Base information

Question	Answer
Related to a SourceForge thread / Another PR / Combodo ticket?	N/A
Type of change?	Bug fix

Symptom

When one of the collectors throws an exception, the complete synchronisation process will stop even when stop_on_synchro_error is disabled.

Reproduction procedure

1. Have a collector that throws an exception during its synchronisation process (DoProcessBeforeSynchro)
2. Run synchro.

Cause

Exception thrown by Collector::Synchronize aren't catched inside Orchestrator::Synchronize.

Proposed solution

Catch exception thrown by Collector::Synchronize inside Orchestrator::Synchronize and log its message before continuing to the next collector.

Checklist before requesting a review

• I have performed a self-review of my code, and that it's compliant with Combodo's guidelines
• I have tested all changes I made on an iTop instance
• I have added a unit test, otherwise I have explained why I couldn't
• I have made sure the PR is clear and detailled enough so anyone can understand the real purpose without digging in the code