preparescript: Add WALLET_ENCRYPTION_PWD env var.

Removed unnecessary START_DAEMONS env var.
Remove all cached addresses from the basicswap db for a wallet after reseeding.
Check that addresses retreived from the db are owned by teh wallet before they're used/displayed

bin/basicswap_run.py

@@ -115,9 +115,15 @@ def ws_message_received(client, server, message):
 
 def runClient(fp, data_dir, chain):
     global swap_client
+    daemons = []
+    pids = []
+    threads = []
     settings_path = os.path.join(data_dir, cfg.CONFIG_FILENAME)
     pids_path = os.path.join(data_dir, '.pids')
 
+    if os.getenv('WALLET_ENCRYPTION_PWD', '') != '':
+        raise ValueError('Please unset the WALLET_ENCRYPTION_PWD environment variable.')
+
     if not os.path.exists(settings_path):
         raise ValueError('Settings file not found: ' + str(settings_path))
 
@@ -126,10 +132,6 @@ def runClient(fp, data_dir, chain):
 
     swap_client = BasicSwap(fp, data_dir, settings, chain)
 
-    daemons = []
-    pids = []
-    threads = []
-
     if os.path.exists(pids_path):
         with open(pids_path) as fd:
             for ln in fd: