This was working but the cause probably comes from freeing Xop object to
  handle memory leaks reported by Valgrind.
  Also add a test case on XML multiple tables.
added:
  storage/connect/mysql-test/connect/r/xml_mult.result
  storage/connect/mysql-test/connect/std_data/bookstore.xml
  storage/connect/mysql-test/connect/t/xml_mult.test
modified:
  storage/connect/domdoc.cpp
  storage/connect/tabxml.cpp
  storage/connect/tabxml.h

- Enhance the index types and flages returning functions.
modified:
  storage/connect/ha_connect.cc
  storage/connect/ha_connect.h

- Suppress irrelevant warning message (MDEV-6117)
modified:
  storage/connect/ha_connect.cc