logging: Reducing log level in several places

INFO level is suppose to be used for informational messages that are
useful for ordinary user, but in several places we used it as a DEBUG
output.

In CS the level is reduced even more, to TRACE.

Change-Id: I9058e25d95de79661099dd4624d802cc33420983
diff --git a/daemon/mgmt/manager-base.cpp b/daemon/mgmt/manager-base.cpp
index e608ffc..5296e28 100644
--- a/daemon/mgmt/manager-base.cpp
+++ b/daemon/mgmt/manager-base.cpp
@@ -100,7 +100,7 @@
 ManagerBase::onCommandValidationFailed(const shared_ptr<const Interest>& command,
                                        const std::string& error)
 {
-  NFD_LOG_INFO("command result: unauthorized command: " << *command);
+  NFD_LOG_DEBUG("command result: unauthorized command: " << *command);
   sendResponse(command->getName(), 403, "Unauthorized command");
 }