flush output on init error and when writing log sentinels (#41)

diff --git a/core/ruby2.5Action/rackapp/init.rb b/core/ruby2.5Action/rackapp/init.rb
index caefe52..1e1fd7f 100644
--- a/core/ruby2.5Action/rackapp/init.rb
+++ b/core/ruby2.5Action/rackapp/init.rb
@@ -9,6 +9,7 @@
     # Make sure that this action is not initialised more than once
     if File.exist? CONFIG then
       puts "Error: Cannot initialize the action more than once."
+      STDOUT.flush
       return ErrorResponse.new 'Cannot initialize the action more than once.', 403
     end
 
diff --git a/core/ruby2.5Action/rackapp/middleware/sentinel_handler.rb b/core/ruby2.5Action/rackapp/middleware/sentinel_handler.rb
index 2161bde..32c05b5 100644
--- a/core/ruby2.5Action/rackapp/middleware/sentinel_handler.rb
+++ b/core/ruby2.5Action/rackapp/middleware/sentinel_handler.rb
@@ -7,7 +7,9 @@
       puts response.body if response.status!=200
       puts "XXX_THE_END_OF_A_WHISK_ACTIVATION_XXX"
       warn "XXX_THE_END_OF_A_WHISK_ACTIVATION_XXX"
+      STDOUT.flush
+      STDERR.flush
     end
     response
   end
-end
\ No newline at end of file
+end