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NTP check broken: Servname not supported for ai_socktype (missing /etc/services from netbase)

See original GitHub issue

Just upgraded from 5.23.0 to 5.24.0 using the official docker image to resolve issue #1346 and it broke the NTP check with the following error:

2018-05-17 11:30:31 UTC | INFO | dd.collector | config(config.py:1249) | initialized checks.d checks: ['kube_dns', 'network', 'kubernetes', 'ntp', 'docker_daemon', 'http_check', 'system_core', 'redisdb', 'disk', 'kube_proxy']
2018-05-17 11:30:31 UTC | INFO | dd.collector | config(config.py:1250) | initialization failed checks.d checks: []
2018-05-17 11:30:31 UTC | INFO | dd.collector | collector(agent.py:166) | Check reload was successful. Running 11 checks.
2018-05-17 11:30:35 UTC | ERROR | dd.collector | checks.ntp(__init__.py:829) | Check 'ntp' instance #0 failed
Traceback (most recent call last):
  File "/opt/datadog-agent/agent/checks/__init__.py", line 812, in run
    self.check(copy.deepcopy(instance))
  File "/opt/datadog-agent/embedded/lib/python2.7/site-packages/datadog_checks/ntp/ntp.py", line 33, in check
    ntp_stats = ntplib.NTPClient().request(**req_args)
  File "/opt/datadog-agent/embedded/lib/python2.7/site-packages/ntplib.py", line 292, in request
    addrinfo = socket.getaddrinfo(host, port)[0]
gaierror: [Errno -8] Servname not supported for ai_socktype

Output of the info page

[0;31mWarning: Known bug in Linux Kernel 3.18+ causes 'status' to fail.[0m
Calling 'info', instead...
====================
Collector (v 5.24.0)
====================

  Status date[0m: 2018-05-17 11:24:41 (6s ago)[0m
  Pid: 37
  Platform: Linux-4.4.111+-x86_64-with-debian-9.4
  Python Version: 2.7.14, 64bit
  Logs: <stderr>, /var/log/datadog/collector.log

  Clocks
  ======
  
    NTP offset: Unknown ([Errno -8] Servname not supported for ai_socktype)
    System UTC time: 2018-05-17 11:24:47.882946
  
  Paths
  =====
  
    conf.d: /etc/dd-agent/conf.d
    checks.d: Not found
  
  Hostnames
  =========
  
    socket-hostname: dd-agent-bsljm
    hostname: <snip>.internal
    socket-fqdn: dd-agent-bsljm
  
  Checks
  ======
  
    kube_dns (1.3.0)
    ----------------
      - instance #0 [[32mOK[0m]
      - Collected 44 metrics, 0 events & 0 service checks
  
    network (1.5.0)
    ---------------
      - instance #0 [[32mOK[0m]
      - Collected 122 metrics, 0 events & 0 service checks
  
    kubernetes (1.5.0)
    ------------------
      - instance #0 [[32mOK[0m]
      - Collected 402 metrics, 0 events & 3 service checks
  
    ntp (1.2.0)
    -----------
      - Collected 0 metrics, 0 events & 0 service checks
  
    docker_daemon (1.10.0)
    ----------------------
      - instance #0 [[32mOK[0m]
      - Collected 527 metrics, 0 events & 1 service check
  
    http_check (2.0.1)
    ------------------
      - instance #0 [[32mOK[0m]
      - instance #1 [[32mOK[0m]
      - Collected 8 metrics, 0 events & 4 service checks
  
    system_core (1.0.0)
    -------------------
      - instance #0 [[32mOK[0m]
      - Collected 41 metrics, 0 events & 0 service checks
  
    redisdb (1.5.0)
    ---------------
      - instance #0 [[32mOK[0m]
      - Collected 44 metrics, 0 events & 1 service check
      - Dependencies:
          - redis: 2.10.5
  
    disk (1.2.0)
    ------------
      - instance #0 [[32mOK[0m]
      - Collected 58 metrics, 0 events & 0 service checks
  
    kube_proxy (Unknown Wheel)
    --------------------------
      - Collected 0 metrics, 0 events & 0 service checks
  
  
  Emitters
  ========
  
    - http_emitter [[32mOK[0m]

====================
Dogstatsd (v 5.24.0)
====================

  Status date[0m: 2018-05-17 11:24:48 (0s ago)[0m
  Pid: 34
  Platform: Linux-4.4.111+-x86_64-with-debian-9.4
  Python Version: 2.7.14, 64bit
  Logs: <stderr>, /var/log/datadog/dogstatsd.log

  Flush count: 119
  Packet Count: 7177
  Packets per second: 5.5
  Metric count: 109
  Event count: 0
  Service check count: 0

====================
Forwarder (v 5.24.0)
====================

  Status date[0m: 2018-05-17 11:24:48 (0s ago)[0m
  Pid: 33
  Platform: Linux-4.4.111+-x86_64-with-debian-9.4
  Python Version: 2.7.14, 64bit
  Logs: <stderr>, /var/log/datadog/forwarder.log

  Queue Size: 1559 bytes
  Queue Length: 1
  Flush Count: 387
  Transactions received: 302
  Transactions flushed: 301
  Transactions rejected: 0
  API Key Status: API Key is valid
  

======================
Trace Agent (v 5.24.0)
======================

  Pid: 32
  Uptime: 1193 seconds
  Mem alloc: 4502136 bytes

  Hostname: <snip>.internal
  Receiver: 0.0.0.0:8126
  API Endpoint: https://trace.agent.datadoghq.com

  --- Receiver stats (1 min) ---

  From go 1.9.2 (gc-amd64-linux), client v0.5.0
    Traces received: 19 (9127 bytes)
    Spans received: 38
    Services received: 0 (0 bytes)


  --- Writer stats (1 min) ---

  Traces: 6 payloads, 18 traces, 4801 bytes
  Stats: 4 payloads, 5 stats buckets, 4440 bytes
  Services: 0 payloads, 0 services, 0 bytes

Additional environment details (Operating System, Cloud provider, etc):