title: Airflow - Unable to import Spark provider - package: name 'client' is not defined
body: <p>I have installed the Apache Spark provider on top of my exiting Airflow 2.0.0 installation with:</p>
  <p><code>pip install apache-airflow-providers-apache-spark</code></p>
  <p>When I start the webserver it is unable to import the provider:</p>
  <pre><code>[2021-01-19 18:49:46,871] {providers_manager.py:279} WARNING - Exception when importing 'airflow.providers.apache.spark.hooks.spark_jdbc.SparkJDBCHook' from 'apache-airflow-providers-apache-spark' package: name 'client' is not defined
  [2021-01-19 18:49:46,873] {providers_manager.py:279} WARNING - Exception when importing 'airflow.providers.apache.spark.hooks.spark_submit.SparkSubmitHook' from 'apache-airflow-providers-apache-spark' package: name 'client' is not defined
  [2021-01-19 18:49:46,941] {providers_manager.py:279} WARNING - Exception when importing 'airflow.providers.apache.spark.hooks.spark_jdbc.SparkJDBCHook' from 'apache-airflow-providers-apache-spark' package: name 'client' is not defined
  [2021-01-19 18:49:46,942] {providers_manager.py:279} WARNING - Exception when importing 'airflow.providers.apache.spark.hooks.spark_submit.SparkSubmitHook' from 'apache-airflow-providers-apache-spark' package: name 'client' is not defined
  </code></pre>
  <p>Any idea how to overcome this.
  For the record I have Python 3.8.5 and pip 20.0.2 on Ubuntu 20.04.</p>
  <p>Thanks!</p>