Retrofit ignored/filtered parameters to 1.0 callback

It's possible in ARA 0.x for users to specify playbook parameters
that won't be saved by ARA.
Add this to the 1.0 callback and rename them to arguments instead
of parameters.

Depends-On: https://review.openstack.org/610389
Change-Id: I517dd6f90eaee15f0d762242750c10a5fc9fc955

ara/plugins/callback/ara_default.py

@@ -80,6 +80,15 @@ options:
     ini:
       - section: ara
         key: ignored_facts
+  ignored_arguments:
+    description: List of Ansible arguments that will not be saved by ARA
+    type: list
+    default: ["extra_vars"]
+    env:
+      - name: ARA_IGNORED_ARGUMENTS
+    ini:
+      - section: ara
+        key: ignored_arguments
 """
 
 
@@ -112,6 +121,7 @@ class CallbackModule(CallbackBase):
         super(CallbackModule, self).set_options(task_keys=task_keys, var_options=var_options, direct=direct)
 
         self.ignored_facts = self.get_option("ignored_facts")
+        self.ignored_arguments = self.get_option("ignored_arguments")
 
         api_client = self.get_option("api_client")
         if api_client == "offline":
@@ -128,15 +138,21 @@ class CallbackModule(CallbackBase):
 
         path = os.path.abspath(playbook._file_name)
         if self._options is not None:
-            parameters = self._options.__dict__.copy()
+            arguments = self._options.__dict__.copy()
         else:
-            parameters = {}
+            arguments = {}
+
+        # Potentially sanitize some user-specified keys
+        for argument in self.ignored_arguments:
+            if argument in arguments:
+                self.log.debug("Ignoring argument: %s" % argument)
+                arguments[argument] = "Not saved by ARA as configured by 'ignored_arguments'"
 
         # Create the playbook
         self.playbook = self.client.post(
             "/api/v1/playbooks",
             ansible_version=ansible_version,
-            parameters=parameters,
+            arguments=arguments,
             file=dict(path=path, content=self._read_file(path)),
         )