[memory_tools] Verbosity level quiet is not working properly

[knorth55]

It seems verbosity level quiet is not working properly.

I add printf in dispatch_callback.cpp and check the callback_prt and service.

I don't know why but callback_ptr changed and service.ignored is rewrite to 0, which causes this issue.
I tried to solve this issue, but I could not find the cause...

before callback: callback_ptr: 0x55f00f880850
before callback: service: 0x7f97db7fd070
before callback: service.ignored: 1
before callback: callback_ptr: 0x55f00f880880
before callback: service: 0x7f97db7fd070
before callback: service.ignored: 0

after callback: service: 0x7f97db7fd070
after callback: service.ignored: 0
after callback: service: 0x7f97db7fd070
after callback: service.ignored: 0

How to check this issue

Please use this PR for printing
#81

Then, I changed as below to show the print output.

--- a/osrf_testing_tools_cpp/src/memory_tools/dispatch_callback.hpp
+++ b/osrf_testing_tools_cpp/src/memory_tools/dispatch_callback.hpp
@@ -38,9 +38,14 @@ dispatch_callback(
     return;
   }
   auto callback_ptr = std::get_if<MemoryToolsCallback>(callback);
+  printf("before callback: callback_ptr: %p\n", callback_ptr);
+  printf("before callback: service: %p\n", &service);
+  printf("before callback: service.ignored: %d\n", service.get_ignored());
   if (callback_ptr) {
     (*callback_ptr)(service);
   }
+  printf("after callback: service: %p\n", &service);
+  printf("after callback: service.ignored: %d\n", service.get_ignored());
   auto simple_callback_ptr = std::get_if<MemoryToolsSimpleCallback>(callback);
   if (simple_callback_ptr) {
     (*simple_callback_ptr)();