optimize: context missing should support ignore error message, or too many error messages when unit testing

Author: sunfuze

lib/aws-xray-sdk/context/default_context.rb

@@ -12,7 +12,7 @@ class DefaultContext
 
     LOCAL_KEY = '_aws_xray_entity'.freeze
     CONTEXT_MISSING_KEY = 'AWS_XRAY_CONTEXT_MISSING'.freeze
-    SUPPORTED_STRATEGY = %w[RUNTIME_ERROR LOG_ERROR].freeze
+    SUPPORTED_STRATEGY = %w[RUNTIME_ERROR LOG_ERROR IGNORE_ERROR].freeze
     DEFAULT_STRATEGY = SUPPORTED_STRATEGY[0]
 
     attr_reader :context_missing