<p>This reverts back to the original behavior.</p>
<p>I tested on a <code>samr21-xpro</code> to have it working.</p>
<p>I compared the versions:</p>
<ul>
<li>before <a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="378743447" data-permission-text="Issue title is private" data-url="https://github.com/RIOT-OS/RIOT/issues/10350" data-hovercard-type="pull_request" data-hovercard-url="/RIOT-OS/RIOT/pull/10350/hovercard" href="https://github.com/RIOT-OS/RIOT/pull/10350">#10350</a> commit <code>git checkout 2cb0ccc800c176bb7d2a1a77606f7c5fd06fb788^</code></li>
<li>riot/master <code>56085b10a0dd48fab8c7b5582fef161d6b13d1e1</code></li>
<li>this pull request</li>
</ul>
<p>With the following test command:</p>
<pre><code>RIOT_CI_BUILD=1 BOARD=samr21-xpro make -C examples/gnrc_networking  flash; { sleep 5; echo ifconfig; sleep 2; } | RIOT_TERMINAL=socat BOARD=samr21-xpro make --no-print-directory -C examples/gnrc_networking term  | tee output
</code></pre>
<p>Using <code>socat</code> to not have the timestamps, and automating sending the ifconfig command.</p>
<p>I get these outputs:</p>
<p>For before the <a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="378743447" data-permission-text="Issue title is private" data-url="https://github.com/RIOT-OS/RIOT/issues/10350" data-hovercard-type="pull_request" data-hovercard-url="/RIOT-OS/RIOT/pull/10350/hovercard" href="https://github.com/RIOT-OS/RIOT/pull/10350">#10350</a> commit breaking and with this pr I get the same output</p>
<pre><code>socat - open:/dev/ttyACM0,b115200,echo=0,raw
ifconfig
Iface  7  HWaddr: 6E:A2  Channel: 26  Page: 0  NID: 0x23
          Long HWaddr: 79:65:3B:4C:F3:BB:EE:A2 
           TX-Power: 0dBm  State: IDLE  max. Retrans.: 3  CSMA Retries: 4 
          AUTOACK  ACK_REQ  CSMA  L2-PDU:102 MTU:1280  HL:64  RTR  
          6LO  IPHC  
          Source address length: 8
          Link type: wireless
          inet6 addr: fe80::7b65:3b4c:f3bb:eea2  scope: local  VAL
          inet6 group: ff02::2
          inet6 group: ff02::1
          inet6 group: ff02::1:ffbb:eea2
          inet6 group: ff02::1a
          
          Statistics for Layer 2
            RX packets 0  bytes 0
            TX packets 3 (Multicast: 3)  bytes 115
            TX succeeded 3 errors 0
          Statistics for IPv6
            RX packets 0  bytes 0
            TX packets 3 (Multicast: 3)  bytes 178
            TX succeeded 3 errors 0


</code></pre>
<p>When on master I had</p>
<pre><code>socat - open:/dev/ttyACM0,b115200,echo=0,raw
ifconfig
Iface  7  HWaddr: 6E:A2  Channel: 26  Page: 0  NID: 0x23
          Long HWaddr: 79:65:3B:4C:F3:BB:EE:A2 
           TX-Power: 0dBm  State: IDLE  max. Retrans.: 3  CSMA Retries: 4 
          AUTOACK  ACK_REQ  CSMA  L2-PDU:102 MTU:1280  HL:64  RTR  
          6LO  IPHC  
          Source address length: 8
          Link type: wireless
          inet6 addr: fe80::7b65:3b4c:f3bb:eea2  scope: local  VAL
inet6 group: ff02::2
inet6 group: ff02::1
inet6 group: ff02::1:ffbb:eea2
inet6 group: ff02::1a

          Statistics for Layer 2
            RX packets 0  bytes 0
            TX packets 3 (Multicast: 3)  bytes 115
            TX succeeded 3 errors 0
          Statistics for IPv6
            RX packets 0  bytes 0
            TX packets 3 (Multicast: 3)  bytes 178
            TX succeeded 3 errors 0


</code></pre>
<div class="highlight highlight-source-diff"><pre><span class="pl-c1">diff -u output_master output_pr </span>
<span class="pl-md">--- output_master       2019-06-26 12:07:28.522508225 +0200</span>
<span class="pl-mi1">+++ output_pr   2019-06-26 12:09:08.815316077 +0200</span>
<span class="pl-mdr">@@ -8,11 +8,11 @@</span>
           Source address length: 8
           Link type: wireless
           inet6 addr: fe80::7b65:3b4c:f3bb:eea2  scope: local  VAL
<span class="pl-md"><span class="pl-md">-</span>inet6 group: ff02::2</span>
<span class="pl-md"><span class="pl-md">-</span>inet6 group: ff02::1</span>
<span class="pl-md"><span class="pl-md">-</span>inet6 group: ff02::1:ffbb:eea2</span>
<span class="pl-md"><span class="pl-md">-</span>inet6 group: ff02::1a</span>
<span class="pl-md"><span class="pl-md">-</span></span>
<span class="pl-mi1"><span class="pl-mi1">+</span>          inet6 group: ff02::2</span>
<span class="pl-mi1"><span class="pl-mi1">+</span>          inet6 group: ff02::1</span>
<span class="pl-mi1"><span class="pl-mi1">+</span>          inet6 group: ff02::1:ffbb:eea2</span>
<span class="pl-mi1"><span class="pl-mi1">+</span>          inet6 group: ff02::1a</span>
<span class="pl-mi1"><span class="pl-mi1">+</span>          </span>
           Statistics for Layer 2
             RX packets 0  bytes 0
             TX packets 3 (Multicast: 3)  bytes 115
</pre></div>

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