Don't log about reloading the microdescriptor cache at startup

Addresses bug 6759.

changes/bug6759

@@ -0,0 +1,6 @@
+  o Minor bugfixes:
+    - Don't log about reloading the microdescriptor cache at startup. Our
+      bootstrap warnings are supposed to tell the user when there's a
+      problem, and our bootstrap notices say when there isn't. Fixes
+      bug 6759; bugfix on 0.2.2.6-alpha.
+

src/or/microdesc.c

@@ -323,8 +323,8 @@ microdesc_cache_reload(microdesc_cache_t *cache)
     }
     tor_free(journal_content);
   }
-  log_notice(LD_DIR, "Reloaded microdescriptor cache.  Found %d descriptors.",
-             total);
+  log_info(LD_DIR, "Reloaded microdescriptor cache. Found %d descriptors.",
+           total);
 
   microdesc_cache_rebuild(cache, 0 /* don't force */);