Merge pull request #117 from telefonicaid/backlog/112

Backlog/112 (into release/iotplatform-v1)
Fix the number of message types in the README
Add an Alarms document
Add INFO traces needed by the alarm system
Remove the message types explanation from the README, putting a simple link to doc/operation/alarms.md
Fix issues raised during code review
Relate the error detection condition with the error stop condition in alarms.md
Relate the error detection condition with the error stop condition in alarms.md
Merge pull request #119 from telefonicaid/backlog/112_alarms

Backlog/112 alarms