fix tests to clean up properly
Merged the majority of the PFS test cases. There are still 19 failing test cases that need more attention.
MySQL 5.6.10 performance schema: merge of the test files for the host_cache table With this patch, all tests perfschema.hostcache_* pass. There are still some additional unmerged minor changes to these tests in mysql 5.6.10.
MySQL 5.6.10 performance schema: merge of the test files for the host_cache table
