Fixing misleading message when polycubed is not executed as root

When running polycubed as normal user, the printed error is misleading, as it appears that polycubed cannot open the log file.

Signed-off-by: Fulvio Risso <fulvio.risso@polito.it>

Author: frisso

src/polycubed/src/polycubed.cpp

@@ -173,6 +173,12 @@ int main(int argc, char *argv[]) {
       exit(EXIT_SUCCESS);
     }
   } catch (const std::exception &e) {
+
+    // The problem of the error in loading the config file may be due to
+    // polycubed executed as normal user
+    if (getuid())
+      logger->critical("polycubed should be executed with root privileges");
+
     logger->critical("Error loading config: {}", e.what());
     exit(EXIT_FAILURE);
   }
@@ -182,7 +188,7 @@ int main(int argc, char *argv[]) {
   logger->set_level(config.getLogLevel());
 
   if (getuid()) {
-    logger->critical("please run polycubed as root");
+    logger->critical("polycubed should be executed with root privileges");
     exit(EXIT_FAILURE);
   }