Fix up new Django 3.0 deprecations

Mostly text based: force/smart_text, ugettext_*

awx/main/scheduler/dag_workflow.py

@@ -1,5 +1,5 @@
-from django.utils.translation import ugettext_lazy as _
-from django.utils.encoding import smart_text
+from django.utils.translation import gettext_lazy as _
+from django.utils.encoding import smart_str
 
 # Python
 from awx.main.models import (
@@ -171,7 +171,7 @@ class WorkflowDAG(SimpleDAG):
                 parms['node_status'] = ",".join(["({},{})".format(id, status) for id, status in failed_path_nodes_id_status])
             if len(failed_unified_job_template_node_ids) > 0:
                 parms['no_ufjt'] = ",".join(failed_unified_job_template_node_ids)
-            return True, smart_text(s.format(**parms))
+            return True, smart_str(s.format(**parms))
         return False, None
 
     r'''

awx/main/scheduler/kubernetes.py

@@ -7,7 +7,7 @@ from urllib import parse as urlparse
 from django.conf import settings
 from kubernetes import client, config
 from django.utils.functional import cached_property
-from django.utils.translation import ugettext_lazy as _
+from django.utils.translation import gettext_lazy as _
 
 from awx.main.utils.common import parse_yaml_or_json, deepmerge
 from awx.main.utils.execution_environments import get_default_pod_spec

awx/main/scheduler/task_manager.py

@@ -10,7 +10,7 @@ from types import SimpleNamespace
 
 # Django
 from django.db import transaction, connection
-from django.utils.translation import ugettext_lazy as _, gettext_noop
+from django.utils.translation import gettext_lazy as _, gettext_noop
 from django.utils.timezone import now as tz_now
 from django.conf import settings