Merge pull request #2334 from dnephin/dont_set_hostname

Don't set the hostname to the service name with networking.

compose/service.py

@@ -601,9 +601,6 @@ class Service(object):
             container_options['hostname'] = parts[0]
             container_options['domainname'] = parts[2]
 
-        if 'hostname' not in container_options and self.use_networking:
-            container_options['hostname'] = self.name
-
         if 'ports' in container_options or 'expose' in self.options:
             ports = []
             all_ports = container_options.get('ports', []) + self.options.get('expose', [])