Change connection errors to warnings.

basicswap/base.py

@@ -134,3 +134,7 @@ class BaseApp:
         if len(out[1]) > 0:
             raise ValueError('CLI error ' + str(out[1]))
         return out[0].decode('utf-8').strip()
+
+    def is_transient_error(ex):
+        str_error = str(ex).tolower()
+        return 'read timed out' in str_error or 'no connection to daemon' in str_error