Remove use of simplejson throughout code base (#43548)

* Remove use of simplejson throughout code base. Fixes #42761

* Address failing tests

* Remove simplejson from contrib and other outlying files

* Add changelog fragment for simplejson removal

lib/ansible/modules/monitoring/sensu_subscription.py

@@ -64,6 +64,8 @@ EXAMPLES = '''
 - name: unsubscribe from common checks
   sensu_subscription: name=common state=absent
 '''
+
+import json
 import traceback
 
 from ansible.module_utils.basic import AnsibleModule
@@ -74,11 +76,6 @@ def sensu_subscription(module, path, name, state='present', backup=False):
     changed = False
     reasons = []
 
-    try:
-        import json
-    except ImportError:
-        import simplejson as json
-
     try:
         config = json.load(open(path))
     except IOError as e: