update .gitignore

.gitignore

 build/UDR/*
-etc/*
+etc/*.conf

etc/udr.conf

-UDR = 
-{
-  INSTANCE_ID = 10;            # 0 is the default
-  PID_DIRECTORY = "/var/run";   # /var/run is the default
-  
-  INTERFACES:
-  {
-    # UDR binded interface for Nudr interface
-    NUDR: 
-    {
-      INTERFACE_NAME = "ens33";  			# YOUR NETWORK CONFIG HERE
-      IPV4_ADDRESS   = "192.168.199.243";
-      PORT           = 8081;                           	# YOUR NETWORK CONFIG HERE
-    };
-  };
-  
-
-  MYSQL:
-  {
-    ## MySQL mandatory options
-    MYSQL_SERVER = "127.0.0.1"; # MySQL Server address
-    MYSQL_USER   = "udr";   # Database server login
-    MYSQL_PASS   = "udr123";   # Database server password
-    MYSQL_DB     = "Witcomm-UDR-DB";     # Your database name
-  };
-};