Add a new exception for invalid structure

This commit fixes too broad exception in output_parser. Otherwise, we
can't assert the Exception in unit tests.

Partially implements bp unit-tests

Change-Id: I9e45571dbf964a37dd9d0249a6f662216d5d046c

tempest/cli/output_parser.py

@@ -17,6 +17,7 @@
 
 import re
 
+from tempest import exceptions
 from tempest.openstack.common import log as logging
 
 
@@ -37,7 +38,7 @@ def details_multiple(output_lines, with_label=False):
     for table_ in tables_:
         if 'Property' not in table_['headers'] \
            or 'Value' not in table_['headers']:
-            raise Exception('Invalid structure of table with details')
+            raise exceptions.InvalidStructure()
         item = {}
         for value in table_['values']:
             item[value[0]] = value[1]