Configuring Red Hat Satellite with Red Hat Single Sign-On Authentication fails with error - ModuleNotFoundError: No module named 'lxml'

Issue

• Configuring Red Hat Satellite with Red Hat Single Sign-On Authentication fails with error - ModuleNotFoundError: No module named 'lxml'.

  # keycloak-httpd-client-install
  
      Traceback (most recent call last):
   File "/usr/bin/keycloak-httpd-client-install", line 19, in <module>
      from keycloak_httpd_client import keycloak_rest
   File "/usr/lib/python3.6/site-packages/keycloak_httpd_client/keycloak_rest.py", line 9, in <module>
      from keycloak_httpd_client import utils
   File "/usr/lib/python3.6/site-packages/keycloak_httpd_client/utils.py", line 21, in <module>
      from lxml import etree
   ModuleNotFoundError: No module named 'lxml'