Replace the use of the 3rd party jsonbfield library

which was just a backport of Django's built-in JSONField.  Also, bump
the version of django-jsonfield.

awx/main/fields.py

@@ -12,7 +12,9 @@ from jinja2.exceptions import UndefinedError, TemplateSyntaxError
 
 # Django
 import django
+from django.contrib.postgres.fields import JSONField as upstream_JSONBField
 from django.core import exceptions as django_exceptions
+from django.core.serializers.json import DjangoJSONEncoder
 from django.db.models.signals import (
     post_save,
     post_delete,
@@ -37,7 +39,6 @@ import jsonschema.exceptions
 
 # Django-JSONField
 from jsonfield import JSONField as upstream_JSONField
-from jsonbfield.fields import JSONField as upstream_JSONBField
 
 # DRF
 from rest_framework import serializers
@@ -91,7 +92,7 @@ class JSONBField(upstream_JSONBField):
     def get_db_prep_value(self, value, connection, prepared=False):
         if connection.vendor == 'sqlite':
             # sqlite (which we use for tests) does not support jsonb;
-            return json.dumps(value)
+            return json.dumps(value, cls=DjangoJSONEncoder)
         return super(JSONBField, self).get_db_prep_value(
             value, connection, prepared
         )
@@ -453,21 +454,6 @@ class JSONSchemaField(JSONBField):
                 params={'value': value},
             )
 
-    def get_db_prep_value(self, value, connection, prepared=False):
-        if connection.vendor == 'sqlite':
-            # sqlite (which we use for tests) does not support jsonb;
-            return json.dumps(value)
-        return super(JSONSchemaField, self).get_db_prep_value(
-            value, connection, prepared
-        )
-
-    def from_db_value(self, value, expression, connection, context):
-        # Work around a bug in django-jsonfield
-        # https://bitbucket.org/schinckel/django-jsonfield/issues/57/cannot-use-in-the-same-project-as-djangos
-        if isinstance(value, str):
-            return json.loads(value)
-        return value
-
 
 @JSONSchemaField.format_checker.checks('vault_id')
 def format_vault_id(value):

awx/main/migrations/0002_squashed_v300_release.py

@@ -13,7 +13,6 @@ from django.conf import settings
 from django.utils.timezone import now
 
 import jsonfield.fields
-import jsonbfield.fields
 import taggit.managers
 
 
@@ -239,7 +238,7 @@ class Migration(migrations.Migration):
                 ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
                 ('timestamp', models.DateTimeField(default=None, help_text='Date and time of the corresponding fact scan gathering time.', editable=False)),
                 ('module', models.CharField(max_length=128)),
-                ('facts', jsonbfield.fields.JSONField(default={}, help_text='Arbitrary JSON structure of module facts captured at timestamp for a single host.', blank=True)),
+                ('facts', awx.main.fields.JSONBField(default={}, help_text='Arbitrary JSON structure of module facts captured at timestamp for a single host.', blank=True)),
                 ('host', models.ForeignKey(related_name='facts', to='main.Host', help_text='Host for the facts that the fact scan captured.')),
             ],
         ),

awx/main/tests/functional/conftest.py

@@ -11,9 +11,9 @@ from django.urls import resolve
 from django.contrib.auth.models import User
 from django.core.serializers.json import DjangoJSONEncoder
 from django.db.backends.sqlite3.base import SQLiteCursorWrapper
-from jsonbfield.fields import JSONField
 
 # AWX
+from awx.main.fields import JSONBField
 from awx.main.models.projects import Project
 from awx.main.models.ha import Instance
 
@@ -737,7 +737,7 @@ def get_db_prep_save(self, value, connection, **kwargs):
 
 @pytest.fixture
 def monkeypatch_jsonbfield_get_db_prep_save(mocker):
-    JSONField.get_db_prep_save = get_db_prep_save
+    JSONBField.get_db_prep_save = get_db_prep_save
 
 
 @pytest.fixture