[2951] Change the port number to 56176 after trac2904_v3 merge

Branch trac2904_v3 has been merged to master. This test was written
before that merge and uses the old port number. Use the new port
56176 instead.

tests/lettuce/configurations/root.config.orig

@@ -10,7 +10,7 @@
     "Auth": {
         "database_file": "data/root.sqlite3",
         "listen_on": [ {
-            "port": 47806,
+            "port": 56176,
             "address": "127.0.0.1"
         } ]
     },