title: Airflow: ImportError: No module named configparser
body: <p>Environment: Python 2.7.5 &amp; Centos 7</p>
  
  <p>I have successfully installed airflow using:</p>
  
  <pre><code>pip install apache-airflow 
  </code></pre>
  
  <p>But when I run </p>
  
  <p><code>airflow initdb</code>, </p>
  
  <p>it says:</p>
  
  <pre><code>   Traceback (most recent call last):
    File "/usr/bin/airflow", line 21, in &lt;module&gt;
      from airflow import configuration
    File "/usr/lib/python2.7/site-packages/airflow/__init__.py", line 35, in &lt;module&gt;
      from airflow import configuration as conf
    File "/usr/lib/python2.7/site-packages/airflow/configuration.py", line 38, in &lt;module&gt;
      from backports.configparser import ConfigParser
  ImportError: No module named configparser
  </code></pre>
  
  <p>What am I missing?</p>