Merge bitcoin/bitcoin#24864: contrib: Use asmap for ASN lookup in makeseeds

667e316 contrib: Update makeseeds to asmap-nextgen (laanwj)
ae00b9e contrib: add seeds progress indicator and remove asmap one in makeseeds script (Jon Atack)
b541803 contrib: Use asmap for ASN lookup in makeseeds (laanwj)

Pull request description:

  Add an argument `-a` to provide a asmap file to do the IP to ASN lookups.

  This speeds up the script greatly, and makes the output deterministic. Also removes the dependency on `dns.lookup`.

  I've annotated the output with ASxxxx comments to provide a way to verify the functionality.

  For now I've added instructions in README.md to download and use the `demo.map` from the asmap repository. When we have some other mechanism for distributing asmap files we could switch to that.

  This continues #24824. I've removed the fallbacks and extra complexity, as everyone will be using the same instructions anyway.

  Co-authored-by: Pieter Wuille <[email protected]>
  Co-authored-by: russeree <[email protected]>

ACKs for top commit:
  sipa:
    ACK 667e316
  dunxen:
    re-ACK 667e316

Tree-SHA512: c4cedfbd1dee6be7547aa92dd9e262c46f0ff8099e647559b2a40eab0cc9874e9a813706630dd5c880390d23f432e789fb3e7e8a09f376f567071e68f5904c65

Author: laanwj

contrib/seeds/.gitignore

@@ -1 +1,2 @@
 seeds_main.txt
+asmap-filled.dat

contrib/seeds/README.md

@@ -8,21 +8,11 @@ and remove old versions as necessary (at a minimum when GetDesirableServiceFlags
 changes its default return value, as those are the services which seeds are added
 to addrman with).
 
-The seeds compiled into the release are created from sipa's DNS seed data, like this:
+The seeds compiled into the release are created from sipa's DNS seed and AS map
+data. Run the following commands from the `/contrib/seeds` directory:
 
     curl https://bitcoin.sipa.be/seeds.txt.gz | gzip -dc > seeds_main.txt
-    python3 makeseeds.py < seeds_main.txt > nodes_main.txt
+    curl https://bitcoin.sipa.be/asmap-filled.dat > asmap-filled.dat
+    python3 makeseeds.py -a asmap-filled.dat < seeds_main.txt > nodes_main.txt
     cat nodes_main_manual.txt >> nodes_main.txt
     python3 generate-seeds.py . > ../../src/chainparamsseeds.h
-
-## Dependencies
-
-Ubuntu, Debian:
-
-    sudo apt-get install python3-dnspython
-
-and/or for other operating systems:
-
-    pip install dnspython
-
-See https://dnspython.readthedocs.io/en/latest/installation.html for more information.