Fixing issues with httpapi (#40388)

* I seem to have forgotten the back half of tests

* Set http timeout from persistent_command_timeout

* Tweak URL generation and provide URL on error

* Push var_options to connection process

* Don't wait forever if coming from persistent

* Don't send the entire contents of variables to ansible-connection

lib/ansible/executor/task_executor.py

@@ -813,7 +813,9 @@ class TaskExecutor:
             self._play_context.timeout = connection.get_option('persistent_command_timeout')
             display.vvvv('attempting to start connection', host=self._play_context.remote_addr)
             display.vvvv('using connection plugin %s' % connection.transport, host=self._play_context.remote_addr)
-            socket_path = self._start_connection()
+            # We don't need to send the entire contents of variables to ansible-connection
+            filtered_vars = dict((key, value) for key, value in variables.items() if key.startswith('ansible'))
+            socket_path = self._start_connection(filtered_vars)
             display.vvvv('local domain socket path is %s' % socket_path, host=self._play_context.remote_addr)
             setattr(connection, '_socket_path', socket_path)
 
@@ -886,7 +888,7 @@ class TaskExecutor:
 
         return handler
 
-    def _start_connection(self):
+    def _start_connection(self, variables):
         '''
         Starts the persistent connection
         '''
@@ -918,8 +920,12 @@ class TaskExecutor:
         # that means only protocol=0 will work.
         src = cPickle.dumps(self._play_context.serialize(), protocol=0)
         stdin.write(src)
-
         stdin.write(b'\n#END_INIT#\n')
+
+        src = cPickle.dumps(variables, protocol=0)
+        stdin.write(src)
+        stdin.write(b'\n#END_VARS#\n')
+
         stdin.flush()
 
         (stdout, stderr) = p.communicate()