On the log-addressing branch: make the index file path calculation
require an explicit selection of packed / non-packed file path.

* subversion/libsvn_fs_fs/util.h
  (svn_fs_fs__path_l2p_index,
   svn_fs_fs__path_p2l_index): add PACKED flag to signature

* subversion/libsvn_fs_fs/util.c
  (path_rev_absolute_internal): new utility function, mostly taken
                                from svn_fs_fs__path_rev_absolute
  (svn_fs_fs__path_l2p_index,
   svn_fs_fs__path_p2l_index,
   svn_fs_fs__path_rev_absolute): re-implement using the new utility

* subversion/libsvn_fs_fs/index.c
  (auto_open_l2p_index,
   get_l2p_header_body,
   get_l2p_page,
   get_p2l_header,
   get_p2l_page,
   prefetch_p2l_page,
   p2l_index_lookup): temp. change to provide the PACKED flag to
                      the changed API.  Will ultimately provided
                      by the revision file struct

* subversion/libsvn_fs_fs/fs_fs.c
  (write_revision_zero): update API callers

* subversion/libsvn_fs_fs/transaction.c
  (commit_body): ditto

git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/log-addressing@1532015 13f79535-47bb-0310-9956-ffa450edef68