Merge lp://staging/~gl-az/percona-server/BT-27444-bug1083700 into lp://staging/percona-server/5.5

This fix does not take into account the existing special small tablespace (size < FSP_EXTENT_SIZE / 2, i.e. 32 pages) handling in fsp_reserve_free_extents(). Such tablespaces have free_limit > size by design. Thus a combination of this and of http://bugs.mysql.com/bug.php?id=68970 aka bug 1169494 (where tablespaces between 32 and 64 pages are treated as big tablespaces even though for them free_limit > size holds, resulting in unexpected or extremely counter-intuitive if intended unsigned math) means that small tablespaces balloon (a testcase innodb_wl6347_comp_indx_stat from 5.6):

@@ -987,7 +987,7 @@
 AND table_name='tab5' AND database_name='test'
 AND index_name like 'idx%' ;
 compress_stat 1
-The size of the tab5.ibd file: 159744
+The size of the tab5.ibd file: 2097152
 # fetch the compressed page and check the stats
 ===============
 Fetch Records
@@ -1013,7 +1013,7 @@
 AND table_name='tab5' AND database_name='test'
 AND index_name like 'idx%' ;
 compress_stat 1
-The size of the tab5.ibd file: 159744
+The size of the tab5.ibd file: 2097152
 # fetch the compressed same page once again and check the stats
 # the stat figures should be same as above query
 ===============
@@ -1040,7 +1040,7 @@
 AND table_name='tab5' AND database_name='test'
 AND index_name like 'idx%' ;
 compress_stat 1
-The size of the tab5.ibd file: 159744
+The size of the tab5.ibd file: 2097152
 #cleanup
 DROP TABLE IF EXISTS tab5;
 #reset the stat table before starting next testcase

mysqltest: Result content mismatch

Thus, we will have to fix bug 1169494 now.