title: Airflow 2 import exception
body: <p>I uninstalled airflow 1.10.12 and installed airflow 2 using python 3.6.9. When I start the webserver without custom DAGs I get warnings:</p>
  <pre><code>[2021-01-12 11:38:58,095] {dagbag.py:440} INFO - Filling up the DagBag from /dev/null
  [2021-01-12 11:38:59,049] {providers_manager.py:283} WARNING - Exception when importing 'airflow.providers.google.cloud.hooks.dataprep.GoogleDataprepHook' from 'apache-airflow-providers-google' package: No module named 'airflow.providers.google.cloud'
  [2021-01-12 11:38:59,050] {providers_manager.py:283} WARNING - Exception when importing 'airflow.providers.google.cloud.hooks.cloud_sql.CloudSQLHook' from 'apache-airflow-providers-google' package: No module named 'airflow.providers.google.cloud'
  [2021-01-12 11:38:59,050] {providers_manager.py:283} WARNING - Exception when importing 'airflow.providers.google.cloud.hooks.cloud_sql.CloudSQLDatabaseHook' from 'apache-airflow-providers-google' package: No module named 'airflow.providers.google.cloud'
  [2021-01-12 11:38:59,050] {providers_manager.py:283} WARNING - Exception when importing 'airflow.providers.google.cloud.hooks.compute_ssh.ComputeEngineSSHHook' from 'apache-airflow-providers-google' package: No module named 'airflow.providers.google.cloud'
  [2021-01-12 11:38:59,050] {providers_manager.py:283} WARNING - Exception when importing 'airflow.providers.google.cloud.hooks.bigquery.BigQueryHook' from 'apache-airflow-providers-google' package: No module named 'airflow.providers.google.cloud'
  [2021-01-12 11:38:59,051] {providers_manager.py:283} WARNING - Exception when importing 'airflow.providers.google.common.hooks.base_google.GoogleBaseHook' from 'apache-airflow-providers-google' package: No module named 'airflow.providers.google.common'
  [2021-01-12 11:38:59,117] {providers_manager.py:283} WARNING - Exception when importing 'airflow.providers.google.cloud.hooks.dataprep.GoogleDataprepHook' from 'apache-airflow-providers-google' package: No module named 'airflow.providers.google.cloud'
  [2021-01-12 11:38:59,117] {providers_manager.py:283} WARNING - Exception when importing 'airflow.providers.google.cloud.hooks.cloud_sql.CloudSQLHook' from 'apache-airflow-providers-google' package: No module named 'airflow.providers.google.cloud'
  [2021-01-12 11:38:59,118] {providers_manager.py:283} WARNING - Exception when importing 'airflow.providers.google.cloud.hooks.cloud_sql.CloudSQLDatabaseHook' from 'apache-airflow-providers-google' package: No module named 'airflow.providers.google.cloud'
  [2021-01-12 11:38:59,118] {providers_manager.py:283} WARNING - Exception when importing 'airflow.providers.google.cloud.hooks.compute_ssh.ComputeEngineSSHHook' from 'apache-airflow-providers-google' package: No module named 'airflow.providers.google.cloud'
  [2021-01-12 11:38:59,118] {providers_manager.py:283} WARNING - Exception when importing 'airflow.providers.google.cloud.hooks.bigquery.BigQueryHook' from 'apache-airflow-providers-google' package: No module named 'airflow.providers.google.cloud'
  [2021-01-12 11:38:59,118] {providers_manager.py:283} WARNING - Exception when importing 'airflow.providers.google.common.hooks.base_google.GoogleBaseHook' from 'apache-airflow-providers-google' package: No module named 'airflow.providers.google.common'
  </code></pre>
  <p>Can this be ignored or what could be the reason?</p>
  <p>Regards
  Oli</p>