<h3>Contribution description</h3>

<p>Few flashers require a longer time to flash code and reset the device and require the test script to wait for a long time before timing out. This PR adds an environment variable that can be set by the user to vary the timeout in accordance with the requirements of the system</p>
<h3>Testing procedure</h3>

<ul>
<li>export RIOT_TEST_TIMEOUT environment variable with the desired timeout</li>
<li>run any test from the test directory</li>
<li>The tests that were already working should succeed as usual</li>
</ul>

<hr>

<h4>You can view, comment on, or merge this pull request online at:</h4>
<p>  <a href='https://github.com/RIOT-OS/RIOT/pull/11853'>https://github.com/RIOT-OS/RIOT/pull/11853</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>dist/pythinlibs/testrunner: dynamic changing of test timeout</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/RIOT-OS/RIOT/pull/11853/files#diff-0">dist/pythonlibs/testrunner/__init__.py</a>
    (8)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/RIOT-OS/RIOT/pull/11853.patch'>https://github.com/RIOT-OS/RIOT/pull/11853.patch</a></li>
  <li><a href='https://github.com/RIOT-OS/RIOT/pull/11853.diff'>https://github.com/RIOT-OS/RIOT/pull/11853.diff</a></li>
</ul>

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