feature/320_die_if_no_logs (discarded)

[frbattid]

• Implements issue https://github.com/telefonicaid/fiware-connectors/issues/320
• Fixes issue https://github.com/telefonicaid/fiware-connectors/issues/302
• 100% unit tests passed

Results :
Tests run: 45, Failures: 0, Errors: 0, Skipped: 0

• (Unofficial) e2e tests passed (emulating a persistence error, ttl=2)

Starting an ordered shutdown of Cygnus
Stopping sources
Stopping http-source (lyfecycle state=START)
There are 1 events within hdfs-channel, Cygnus cannnot shutdown yet
Waiting 5 seconds
There are 1 events within hdfs-channel, Cygnus cannnot shutdown yet
Waiting 5 seconds
There are 1 events within hdfs-channel, Cygnus cannnot shutdown yet
Waiting 5 seconds
All the channels are empty
Stopping channels
Stopping hdfs-channel (lyfecycle state=START)
Stopping sinks
Stopping hdfs-sink (lyfecycle state=START)

• Ths PR must be twined into develop
• Assignee: @fgalan , but LGTM from @gtorodelvalle is also required

[frbattid]

This PR will be closed since the implemented functionality (nor any other one, except for bugs) won't be merged into release/0.6.0.