Added missing tests for innodb persistent statistics (from mysql-5.6.10)

Made sure that innodb tables for persistent statistics would not
considered by the server as system tables.

mysql-test/suite/innodb/include/innodb_stats.inc

@@ -0,0 +1,26 @@
+TRUNCATE TABLE test_innodb_stats;
+
+-- eval $insert
+
+ANALYZE TABLE test_innodb_stats;
+
+query_vertical SELECT
+stat_name,
+stat_value,
+sample_size,
+stat_description
+FROM mysql.innodb_index_stats
+WHERE
+database_name = DATABASE() AND
+table_name = 'test_innodb_stats' AND
+index_name = 'a_key' AND
+stat_name IN ('n_diff_pfx01', 'n_diff_pfx02', 'n_leaf_pages', 'size')
+ORDER BY stat_name;
+
+# provoke reading from persistent storage upon next table access (the SELECT
+# from information_schema.statistics below)
+FLUSH TABLE test_innodb_stats;
+
+# see what we are going to read
+query_vertical SELECT * FROM information_schema.statistics
+WHERE table_name = 'test_innodb_stats';