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/r/innodb_stats_fetch.result

@@ -0,0 +1,145 @@
+CREATE TABLE test_ps_fetch
+(a INT, b INT, c INT, d INT, PRIMARY KEY (a, b), INDEX idx (c, d))
+ENGINE=INNODB STATS_PERSISTENT=1;
+ANALYZE TABLE test_ps_fetch;
+Table	test.test_ps_fetch
+Op	analyze
+Msg_type	status
+Msg_text	OK
+SELECT n_rows, clustered_index_size, sum_of_other_index_sizes
+FROM mysql.innodb_table_stats WHERE table_name = 'test_ps_fetch';
+n_rows	0
+clustered_index_size	1
+sum_of_other_index_sizes	1
+SELECT index_name, stat_name, stat_value, sample_size, stat_description
+FROM mysql.innodb_index_stats WHERE table_name = 'test_ps_fetch'
+ORDER BY index_name, stat_name;
+index_name	PRIMARY
+stat_name	n_diff_pfx01
+stat_value	0
+sample_size	1
+stat_description	a
+index_name	PRIMARY
+stat_name	n_diff_pfx02
+stat_value	0
+sample_size	1
+stat_description	a,b
+index_name	PRIMARY
+stat_name	n_leaf_pages
+stat_value	1
+sample_size	NULL
+stat_description	Number of leaf pages in the index
+index_name	PRIMARY
+stat_name	size
+stat_value	1
+sample_size	NULL
+stat_description	Number of pages in the index
+index_name	idx
+stat_name	n_diff_pfx01
+stat_value	0
+sample_size	1
+stat_description	c
+index_name	idx
+stat_name	n_diff_pfx02
+stat_value	0
+sample_size	1
+stat_description	c,d
+index_name	idx
+stat_name	n_diff_pfx03
+stat_value	0
+sample_size	1
+stat_description	c,d,a
+index_name	idx
+stat_name	n_diff_pfx04
+stat_value	0
+sample_size	1
+stat_description	c,d,a,b
+index_name	idx
+stat_name	n_leaf_pages
+stat_value	1
+sample_size	NULL
+stat_description	Number of leaf pages in the index
+index_name	idx
+stat_name	size
+stat_value	1
+sample_size	NULL
+stat_description	Number of pages in the index
+SELECT index_name, seq_in_index, column_name, cardinality
+FROM information_schema.statistics WHERE table_name = 'test_ps_fetch'
+ORDER BY index_name, seq_in_index;
+index_name	idx
+seq_in_index	1
+column_name	c
+cardinality	0
+index_name	idx
+seq_in_index	2
+column_name	d
+cardinality	0
+index_name	PRIMARY
+seq_in_index	1
+column_name	a
+cardinality	0
+index_name	PRIMARY
+seq_in_index	2
+column_name	b
+cardinality	0
+SELECT
+table_rows, avg_row_length, max_data_length, index_length
+FROM information_schema.tables WHERE table_name = 'test_ps_fetch';
+table_rows	0
+avg_row_length	0
+max_data_length	0
+index_length	16384
+UPDATE mysql.innodb_table_stats SET
+n_rows = 1000,
+clustered_index_size = 5
+WHERE
+table_name = 'test_ps_fetch';
+UPDATE mysql.innodb_index_stats SET
+stat_value = 20
+WHERE
+table_name = 'test_ps_fetch' AND
+index_name = 'PRIMARY' AND
+stat_name = 'n_diff_pfx01';
+UPDATE mysql.innodb_index_stats SET
+stat_value = 90
+WHERE
+table_name = 'test_ps_fetch' AND
+index_name = 'PRIMARY' AND
+stat_name = 'n_diff_pfx02';
+UPDATE mysql.innodb_index_stats SET
+stat_value = 3
+WHERE
+table_name = 'test_ps_fetch' AND
+index_name = 'idx' AND
+stat_name = 'n_diff_pfx01';
+UPDATE mysql.innodb_index_stats SET
+stat_value = 11
+WHERE
+table_name = 'test_ps_fetch' AND
+index_name = 'idx' AND
+stat_name = 'n_diff_pfx02';
+FLUSH TABLE test_ps_fetch;
+SELECT seq_in_index, column_name, cardinality
+FROM information_schema.statistics WHERE table_name = 'test_ps_fetch'
+ORDER BY index_name, seq_in_index;
+seq_in_index	1
+column_name	c
+cardinality	6
+seq_in_index	2
+column_name	d
+cardinality	22
+seq_in_index	1
+column_name	a
+cardinality	40
+seq_in_index	2
+column_name	b
+cardinality	200
+SELECT
+table_rows, avg_row_length, max_data_length, index_length
+FROM information_schema.tables WHERE table_name = 'test_ps_fetch';
+table_rows	1000
+avg_row_length	81
+max_data_length	0
+index_length	16384
+DROP TABLE test_ps_fetch;