Update conf file with variables

etc/udr.conf

 UDR = 
 {
-  INSTANCE_ID = 10;             # 0 is the default
-  PID_DIRECTORY = "/var/run";   # /var/run is the default
+  INSTANCE_ID = @INSTANCE@;             # 0 is the default
+  PID_DIRECTORY = "@PID_DIRECTORY@";   # /var/run is the default
   
   INTERFACES:
   {
     # UDR binded interface for Nudr interface
     NUDR: 
     {
-      INTERFACE_NAME = "eth0";  			# YOUR NETWORK CONFIG HERE
+      INTERFACE_NAME = "@UDR_INTERFACE_NAME_FOR_NUDR@";  	  # YOUR NETWORK CONFIG HERE
       IPV4_ADDRESS   = "read";
-      PORT           = 80;               	# YOUR NETWORK CONFIG HERE
-      HTTP2_PORT     = 8080;                # YOUR NETWORK CONFIG HERE
-      API_VERSION    = "v1";                # YOUR NUDR API VERSION CONFIG HERE
+      PORT           = @UDR_INTERFACE_PORT_FOR_NUDR@;         # YOUR NETWORK CONFIG HERE
+      HTTP2_PORT     = @UDR_INTERFACE_HTTP2_PORT_FOR_NUDR@;   # YOUR NETWORK CONFIG HERE
+      API_VERSION    = "@UDR_API_VERSION@";                   # YOUR NUDR API VERSION CONFIG HERE
       
     };
   };
@@ -20,9 +20,9 @@ UDR =
   MYSQL:
   {
     ## MySQL mandatory options
-    MYSQL_SERVER = "127.0.0.1"; # MySQL Server address
-    MYSQL_USER   = "root";      # Database server login
-    MYSQL_PASS   = "linux";     # Database server password
-    MYSQL_DB     = "oai_db";    # Your database name
+    MYSQL_SERVER = "@MYSQL_IPV4_ADDRESS@"; # YOUR MYSQL DB ADDRESS HERE
+    MYSQL_USER   = "@MYSQL_USER@";         # YOUR MYSQL USER HERE
+    MYSQL_PASS   = "@MYSQL_PASS@";         # YOUR MYSQL PASSWORD HERE
+    MYSQL_DB     = "oai_db";               # YOUR DATA BASE NAME HERE
   };
 };