Commits on Mar 9, 2017

1. config: shell out to dd-agent to retrieve hostname …

   The infrastructure agent implements more refined logic for
   inferring hostname of the machine this process is running on
   https://github.com/DataDog/dd-agent/blob/7cd0986e137683195f129b2a988dd60ca9ccf0ea/utils/hostname.py#L48
   
   Prior to this change, the trace-agent would identify as a different host
   than the infra agent in subtle cases (EC2 / GCE for example). This
   created phantom hosts and general inconsistency in the UI
   
   We shell out to the infra agent, via the following command, falling back
   to running `os.Hostname()` when it fails
   
   ```
   PYTHONPATH=/opt/datadog-agent/agent /opt/datadog-agent/embedded/bin/python -c "from utils.hostname import get_hostname; print get_hostname()"
   ```

   

   talwai committed Mar 9, 2017
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