src: fix canonization by resetting io service after each neighbor

refs: #4872

Change-Id: I87e83eb36f1a17d0dc2633f04c529f71d751a497
diff --git a/src/conf-file-processor.cpp b/src/conf-file-processor.cpp
index a468e6c..d3e75be 100644
--- a/src/conf-file-processor.cpp
+++ b/src/conf-file-processor.cpp
@@ -489,6 +489,7 @@
                          m_io,
                          TIME_ALLOWED_FOR_CANONIZATION);
         m_io.run();
+        m_io.reset();
 
         if (failedToCanonize) {
           return false;