Follow-up to r1589048: update callers of deprecated svn_fs_open().

* subversion/tests/cmdline/lock-helper.c
* subversion/tests/libsvn_fs_fs/fs-fs-pack-test.c
* subversion/tests/libsvn_fs_x/fs-x-pack-test.c
* subversion/tests/svn_test_fs.c
* tools/server-side/fsfs-stats.c
  (main, create_packed_filesystem, prepare_revprop_repo, read_packed_fs,
   recover_fully_packed, file_hint_at_shard_boundary, test_info,
   pack_shard_size_one, upgrade_txns_to_log_addressing, svn_test__create_fs,
   fs_open): Use svn_fs_open2() instead of svn_fs_open().


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1589109 13f79535-47bb-0310-9956-ffa450edef68