Update parser name in ec2-cpu-utilization monitor
Update parser name in ec2-cpu-utilization monitor

Now there is only one instance_group for the parsers called `parser`
only. We update the exclusion on the ec2-cpu-utilization monitor in
datadog.

alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf