Remove SAML authentication (#15568)

* remove saml

* remove license file and management command

* update requirements, add migrations

* remove unused imports

awxkit/awxkit/api/pages/settings.py

@@ -14,7 +14,6 @@ page.register_page(
         resources.settings_authentication,
         resources.settings_changed,
         resources.settings_jobs,
-        resources.settings_saml,
         resources.settings_system,
         resources.settings_ui,
         resources.settings_user,

awxkit/awxkit/api/resources.py

@@ -212,7 +212,6 @@ class Resources(object):
     _settings_jobs = 'settings/jobs/'
     _settings_logging = 'settings/logging/'
     _settings_named_url = 'settings/named-url/'
-    _settings_saml = 'settings/saml/'
     _settings_system = 'settings/system/'
     _settings_ui = 'settings/ui/'
     _settings_user = 'settings/user/'