Merge remote-tracking branch 'origin/maint-0.2.3' into maint-0.2.4

Conflicts:
	src/or/microdesc.c

changes/bug7164_downgrade

+  o Minor bugfixes:
+    - Downgrade the warning severity for the the "md was still referenced 1
+      node(s)" warning. Tor 0.2.5.4-alpha has better code for trying to
+      diagnose this bug, and the current warning in earlier versions of
+      tor achieves nothing useful. Addresses warning from bug 7164.
+

src/or/microdesc.c

@@ -614,7 +614,7 @@ microdesc_free_(microdesc_t *md, const char *fname, int lineno)
         }
       });
     if (found) {
-      log_warn(LD_BUG, "microdesc_free() called from %s:%d, but md was still "
+      log_info(LD_BUG, "microdesc_free() called from %s:%d, but md was still "
                "referenced %d node(s); held_by_nodes == %u",
                fname, lineno, found, md->held_by_nodes);
     } else {