External users should not be able to change their password (#13491)

* Azure AD users should not be able to change their password

* Multiple auth changes

Moving get_external_user function into awx.sso.common
Altering get_external_user to not look at current config, just user object values
Altering how api/conf.py detects external auth config (and making reusable function in awx.sso.common)
Altering logic in api.serializers in _update_pasword to use awx.sso.common

* Adding unit tests

---------

Co-authored-by: John Westcott IV <john.westcott.iv@redhat.com>

awx/main/utils/common.py

@@ -80,7 +80,6 @@ __all__ = [
     'set_environ',
     'IllegalArgumentError',
     'get_custom_venv_choices',
-    'get_external_account',
     'ScheduleTaskManager',
     'ScheduleDependencyManager',
     'ScheduleWorkflowManager',
@@ -1089,29 +1088,6 @@ def has_model_field_prefetched(model_obj, field_name):
     return getattr(getattr(model_obj, field_name, None), 'prefetch_cache_name', '') in getattr(model_obj, '_prefetched_objects_cache', {})
 
 
-def get_external_account(user):
-    from django.conf import settings
-
-    account_type = None
-    if getattr(settings, 'AUTH_LDAP_SERVER_URI', None):
-        try:
-            if user.pk and user.profile.ldap_dn and not user.has_usable_password():
-                account_type = "ldap"
-        except AttributeError:
-            pass
-    if (
-        getattr(settings, 'SOCIAL_AUTH_GOOGLE_OAUTH2_KEY', None)
-        or getattr(settings, 'SOCIAL_AUTH_GITHUB_KEY', None)
-        or getattr(settings, 'SOCIAL_AUTH_GITHUB_ORG_KEY', None)
-        or getattr(settings, 'SOCIAL_AUTH_GITHUB_TEAM_KEY', None)
-        or getattr(settings, 'SOCIAL_AUTH_SAML_ENABLED_IDPS', None)
-    ) and user.social_auth.all():
-        account_type = "social"
-    if (getattr(settings, 'RADIUS_SERVER', None) or getattr(settings, 'TACACSPLUS_HOST', None)) and user.enterprise_auth.all():
-        account_type = "enterprise"
-    return account_type
-
-
 class classproperty:
     def __init__(self, fget=None, fset=None, fdel=None, doc=None):
         self.fget = fget