Merge bitcoin/bitcoin#23996: test: set ban after mocking time

c9374af test: set ban after mocking time (brunoerg)

Pull request description:

  Fixes #23988

  Set ban after mocking time to avoid intermittent failures related to the assertion of ban_duration and time_remaining.

  See: https://cirrus-ci.com/task/6754020390862848?logs=ci#L4652

ACKs for top commit:
  mzumsande:
    Tested ACK c9374af
  vincenzopalazzo:
    ACK bitcoin/bitcoin@c9374af

Tree-SHA512: fac3ac91a045bb46334d7c568f6a53a3b0a45b306914a54ea13bcc845734eaaad1ff295ff3ab158037fd9d08df77344058331336110b8f7888832b16b0589be5

Author: fanquake

test/functional/p2p_disconnect_ban.py

@@ -57,11 +57,11 @@ def run_test(self):
         assert_equal(len(self.nodes[1].listbanned()), 0)
 
         self.log.info("setban: test persistence across node restart")
-        self.nodes[1].setban("127.0.0.0/32", "add")
-        self.nodes[1].setban("127.0.0.0/24", "add")
         # Set the mocktime so we can control when bans expire
         old_time = int(time.time())
         self.nodes[1].setmocktime(old_time)
+        self.nodes[1].setban("127.0.0.0/32", "add")
+        self.nodes[1].setban("127.0.0.0/24", "add")
         self.nodes[1].setban("192.168.0.1", "add", 1)  # ban for 1 seconds
         self.nodes[1].setban("2001:4d48:ac57:400:cacf:e9ff:fe1d:9c63/19", "add", 1000)  # ban for 1000 seconds
         listBeforeShutdown = self.nodes[1].listbanned()