GH-525: introduce a new arg --entry-dns inside the shared_app()

masq_lib/src/shared_schema.rs

@@ -50,6 +50,7 @@ pub const EARNING_WALLET_HELP: &str =
      (case-insensitive). If you already have a derivation-path earning wallet, don't supply this. \
      If you have supplied an earning wallet address before, either don't supply it again or be \
      careful to supply exactly the same one you supplied before.";
+pub const ENTRY_DNS_HELP: &str = "Specify whether to use entry DNS.";
 pub const IP_ADDRESS_HELP: &str = "The public IP address of your MASQ Node: that is, the IPv4 \
      address at which other Nodes can contact yours. If you're running your Node behind \
      a router, this will be the IP address of the router. If this IP address starts with 192.168 or 10.0, \
@@ -408,6 +409,14 @@ pub fn shared_app(head: App<'static, 'static>) -> App<'static, 'static> {
         EARNING_WALLET_HELP,
         common_validators::validate_ethereum_address,
     ))
+    .arg(
+        Arg::with_name("entry-dns")
+            .long("entry-dns")
+            .value_name("ENTRY-DNS")
+            .required(false)
+            .takes_value(false)
+            .help(ENTRY_DNS_HELP),
+    )
     .arg(
         Arg::with_name("fake-public-key")
             .long("fake-public-key")
@@ -741,6 +750,7 @@ mod tests {
              If you have supplied an earning wallet address before, either don't supply it again or be \
              careful to supply exactly the same one you supplied before."
         );
+        assert_eq!(ENTRY_DNS_HELP, "Specify whether to use entry DNS.");
         assert_eq!(
             IP_ADDRESS_HELP,
             "The public IP address of your MASQ Node: that is, the IPv4 \