Fixed exposed credentials in exception

Under certain conditions, sensitive connection parameters are shown in tracebacks when Ansible receives an unexpected response (in my case `None`) from `set_options` in ansible-connection. This patch creates a list of sensitive connection parameter names from `ansible.constants`, pulls a list of those values in the `params` that are about to be dumped to the screen and log file, and sends the `params` and list of `sensitive_values` to the `module_utils.common.parameters.remove_values` function for processing to hide them before being exposed.

lib/ansible/module_utils/connection.py

@@ -38,10 +38,13 @@
 import uuid
 
 from functools import partial
+from ansible import constants as C
 from ansible.module_utils._text import to_bytes, to_text
 from ansible.module_utils.common.json import AnsibleJSONEncoder
+from ansible.module_utils.common.parameters import remove_values
 from ansible.module_utils.six import iteritems
 from ansible.module_utils.six.moves import cPickle
+from ansible.utils.helpers import deduplicate_list
 
 
 def write_to_file_descriptor(fd, obj):
@@ -163,12 +166,26 @@ def _exec_jsonrpc(self, name, *args, **kwargs):
         try:
             response = json.loads(out)
         except ValueError:
-            params = [repr(arg) for arg in args] + ['{0}={1!r}'.format(k, v) for k, v in iteritems(kwargs)]
+            sensitive_keys = list(
+                    C.MAGIC_VARIABLE_MAPPING["password"]
+                    + C.MAGIC_VARIABLE_MAPPING["private_key_file"]
+                    + C.MAGIC_VARIABLE_MAPPING["become_pass"]
+            )
+            sensitive_values = [
+                v2 
+                for k, v in iteritems(kwargs) 
+                for k2, v2 in iteritems(v) 
+                if k2 in sensitive_keys
+            ]
+            params = [repr(remove_values(arg, sensitive_values)) for arg in args] + [
+                "{0}={1!r}".format(k, remove_values(v, sensitive_values)) 
+                for k, v in iteritems(kwargs)]
             params = ', '.join(params)
             raise ConnectionError(
                 "Unable to decode JSON from response to {0}({1}). Received '{2}'.".format(name, params, out)
             )
 
+
         if response['id'] != reqid:
             raise ConnectionError('invalid json-rpc id received')
         if "result_type" in response: