update per CityOfZion#1020 (comment)

- restore warning in case privatenet database is different from the one you're connecting to (e.g. because you restarted your docker image or single node)

neo/bin/api_server.py

@@ -44,7 +44,7 @@
 from neo.Wallets.utils import to_aes_key
 from neo.Implementations.Wallets.peewee.UserWallet import UserWallet
 from neo.Network.p2pservice import NetworkService
-from neo.Settings import settings
+from neo.Settings import settings, PrivnetConnectionError
 from neo.Utils.plugin import load_class_from_path
 from neo.Wallets.utils import to_aes_key
 from contextlib import suppress
@@ -152,7 +152,11 @@ async def setup_and_start(loop):
     elif args.testnet:
         settings.setup_testnet()
     elif args.privnet:
-        settings.setup_privnet()
+        try:
+            settings.setup_privnet()
+        except PrivnetConnectionError as e:
+            print(e)
+            raise SystemExit
     elif args.coznet:
         settings.setup_coznet()