[Fetch] do not speak warning diagnostics to avoid noisy fetch

jsk_fetch_robot/jsk_fetch_startup/scripts/warning.py

@@ -71,7 +71,7 @@ def __init__(self):
         self.diagnostics_speak_thread = {}
         self.auto_undocking = False
         self.diagnostics_list = []
-        if rospy.get_param("~speak_warn", True):
+        if rospy.get_param("~speak_warn", False):
             self.diagnostics_list.append(DiagnosticStatus.WARN)
         if rospy.get_param("~speak_error", True):
             self.diagnostics_list.append(DiagnosticStatus.ERROR)