[server] Introduce query server package

- Add `server/exceptions.py`

Author:     Alexander Shorin <[email protected]>
Patched by: Iblis Lin <[email protected]>

- Rename `ViewServerException` to `QueryServerException`

Reference: djc#268
See Also:  djc#276

Author: kxepal

couchdb/server/__init__.py

@@ -0,0 +1,18 @@
+# -*- coding: utf-8 -*-
+#
+
+
+class QueryServerException(Exception):
+    """Base query server exception"""
+
+
+class Error(QueryServerException):
+    """Non fatal error which should not terminate query serve"""
+
+
+class FatalError(QueryServerException):
+    """Fatal error which should terminates query server"""
+
+
+class Forbidden(QueryServerException):
+    """Non fatal error which signs access deny for processed operation"""