Percona-Server-5.6.14-rel62.0 merge

support ha_innodb.so as a dynamic plugin.
* remove obsolete *,innodb_plugin.rdiff files
* s/--plugin-load=/--plugin-load-add=/
* MYSQL_PLUGIN_IMPORT glob_hostname[]
* use my_error instead of push_warning_printf(ER_DEFAULT)
* don't use tdc_size and tc_size in a module

update test cases (XtraDB is 5.6.14, InnoDB is 5.6.10)
* copy new tests over
* disable some tests for (old) InnoDB
* delete XtraDB tests that no longer apply

small compatibility changes:
* s/HTON_EXTENDED_KEYS/HTON_SUPPORTS_EXTENDED_KEYS/
* revert unnecessary InnoDB changes to make it a bit closer to the upstream

fix XtraDB to compile on Windows (both as a static and a dynamic plugin)

disable XtraDB on Windows (deadlocks) and where no atomic ops are available (e.g. CentOS 5)


storage/innobase/handler/ha_innodb.cc:
  revert few unnecessary changes to make it a bit closer to the original InnoDB
storage/innobase/include/univ.i:
  correct the version to match what it was merged from

mysql-test/mysql-test-run.pl

@@ -4822,6 +4822,7 @@ sub extract_warning_lines ($$) {
      qr|Plugin 'FEEDBACK' init function returned error|,
      qr|Plugin 'FEEDBACK' registration as a INFORMATION SCHEMA failed|,
      qr|'log-bin-use-v1-row-events' is MySQL 5.6 compatible option|,
+     qr|InnoDB: Setting thread \d+ nice to \d+ failed, current nice \d+, errno 13|, # setpriority() fails under valgrind
     );
 
   my $matched_lines= [];