Merge fix

partition_mgm did not require have_symlink.

Moved the test case to partition_symlink, which
require have_symlink, and should work on both *nix and
Windows


mysql-test/r/partition_mgm.result:
  Bug#32091: Security breach via directory changes
  
  Moved the test case to partition_symlink.
mysql-test/t/partition_mgm.test:
  Bug#32091: Security breach via directory changes
  
  Moved the test case to partition_symlink.
mysql-test/r/partition_symlink.result:
  Bug#32091: Security breach via directory changes
  
  Moved the test case to partition_symlink. It requires
  have_symlink.
mysql-test/t/partition_symlink.test:
  Bug#32091: Security breach via directory changes
  
  Moved the test case to partition_symlink. It requires
  have_symlink.