DICOM parser fails to emit IP address information

[ransford]

Describe the bug IP address information should be included in DICOM message summaries.

$ tapirx -pcap testdata/dicom_arq_4_get_bogus_local.pcap -verbose | jq
{
  "ipv4_address": "",
  "ipv6_address": "",
  "open_port_tcp": "",
  "connect_port_tcp": "",
  "mac_address": "40:00:00:00:40:00",
  "identifier": "testclient",
  "provenance": "DICOM",
  "last_seen": "2019-02-13T12:55:40.737102-08:00",
  "client_id": ""
}

... should look similar to

$ tapirx -pcap testdata/HL7-ADT-UDI-OBX.pcap -verbose | jq
{
  "ipv4_address": "10.0.0.155",
  "ipv6_address": "",
  "open_port_tcp": "",
  "connect_port_tcp": "",
  "mac_address": "00:03:b1:b5:b6:48",
  "identifier": "Hospira Plum A+",
  "provenance": "HL7 OBX-18",
  "last_seen": "2019-02-13T12:56:04.895568-08:00",
  "client_id": ""
}

Platform (please complete the following information):

• OS: [e.g., Windows 10, macOS 10.14.2, CentOS 7]
• Output of tapirx -version: Tapirx 1.0.0-17-g9042a2b
• Output of go version: go version go1.11.5 darwin/amd64