title: Apache Airflow - 1.10.4 - logging_mixin.py - Printing ASCII characters on logs
body: <p>I'm receiving strange characters from {logging_mixin.py} : </p>
  
  <pre><code>[2019-08-15 22:06:57,130] {{logging_mixin.py:95}} INFO - [[34m2019-08-15 22:06:57,129[0m] {[34mbase_hook.py:[0m84} INFO[0m - Using connection to: [1mid: winrm_uat. Host: pgi-ms-wadmtm02.mgmt.msci.org, Port: None, Schema: None, Login:
  </code></pre>
  
  <p>This was produced after update from 1.10.3 to 1.10.4. </p>
  
  <p>I haven't changed anything from Dockerfile related to LC : </p>
  
  <pre><code>ENV LANGUAGE en_US.UTF-8
  ENV LANG en_US.UTF-8
  ENV LC_ALL en_US.UTF-8
  ENV LC_CTYPE en_US.UTF-8
  ENV LC_MESSAGES en_US.UTF-8
  </code></pre>