Duplicate CloudWatch Agent service

[dmartin]

The Ubuntu Server AMIs seem to already include a CloudWatch agent service, which ends up being the one running rather than the one installed by the cloudwatch_agent role:

# systemctl list-units | grep cloudwatch
  amazon-cloudwatch-agent.service                                          loaded active     running   Amazon CloudWatch Agent
● cloudwatch_agent.service                                                 loaded failed     failed    CloudWatch Agent

Investigate this more and see if there is any downside to just using the preinstalled one (i.e. is it picking up the config specified in the playbook correctly?) If not, remove the cloudwatch_agent role - there's little sense in duplicating and maintaining it if it's already included officially.