fix can not generate ovs-dpdk.conf

Change-Id: I0ecc10f8035f421d7dc1132c2b29db0d9cc84cdf
Closes-Bug: #1879125

tools/ovs-dpdkctl.sh

@@ -348,6 +348,9 @@ function unconfigure_kernel_modules {
 }
 
 function install {
+    if [ ! -e "$CONFIG_FILE" ]; then
+        gen_config
+    fi
     configure_kernel_modules
     if [ ! -e "$SERVICE_FILE" ]; then
         install_service
@@ -356,9 +359,6 @@ function install {
         cp "$FULL_PATH" /bin/ovs-dpdkctl
         chmod +x /bin/ovs-dpdkctl
     fi
-    if [ ! -e "$CONFIG_FILE" ]; then
-        gen_config
-    fi
     systemctl start ovs-dpdkctl
     install_network_manager_conf
     if  [[ $(is_redhat_family) == 0 ]]; then