Remove postgresql log files

src/freedombone-logging

     fi
     sed -i 's|#log_destination|log_destination|g' /etc/postgresql/9.6/main/postgresql.conf
     sed -i "s|log_destination.*|log_destination = 'syslog'|g" /etc/postgresql/9.6/main/postgresql.conf
+    if [ -d /var/log/postgresql ]; then
+        $REMOVE_FILES_COMMAND /var/log/postgresql/*
+    fi
 }
 
 function turn_on_postgresql_logging {