qapi: Make 'allow-oob' optional in SchemaInfoCommand

Making 'allow-oob' optional in SchemaInfoCommand permits omitting it
in the common case.  Shrinks query-qmp-schema's output from 122.1KiB
to 118.6KiB for me.

Note that out-of-band execution is still experimental (you have to
configure the monitor with x-oob=on to use it).

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20180718090557.17248-1-armbru@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>

qapi/introspect.json

@@ -259,8 +259,8 @@
 #
 # @ret-type: the name of the command's result type.
 #
-# @allow-oob: whether the command allows out-of-band execution.
-#             (Since: 2.12)
+# @allow-oob: whether the command allows out-of-band execution,
+#             defaults to false (Since: 2.12)
 #
 # TODO: @success-response (currently irrelevant, because it's QGA, not QMP)
 #
@@ -268,7 +268,7 @@
 ##
 { 'struct': 'SchemaInfoCommand',
   'data': { 'arg-type': 'str', 'ret-type': 'str',
-            'allow-oob': 'bool' } }
+            '*allow-oob': 'bool' } }
 
 ##
 # @SchemaInfoEvent:

scripts/qapi/introspect.py

@@ -184,11 +184,11 @@ const QLitObject %(c_name)s = %(c_string)s;
                       success_response, boxed, allow_oob, allow_preconfig):
         arg_type = arg_type or self._schema.the_empty_object_type
         ret_type = ret_type or self._schema.the_empty_object_type
-        self._gen_qlit(name, 'command',
-                       {'arg-type': self._use_type(arg_type),
-                        'ret-type': self._use_type(ret_type),
-                        'allow-oob': allow_oob},
-                       ifcond)
+        obj = {'arg-type': self._use_type(arg_type),
+               'ret-type': self._use_type(ret_type) }
+        if allow_oob:
+            obj['allow-oob'] = allow_oob
+        self._gen_qlit(name, 'command', obj, ifcond)
 
     def visit_event(self, name, info, ifcond, arg_type, boxed):
         arg_type = arg_type or self._schema.the_empty_object_type