On the fsfs-lock-many branch: convert svn_repos_fs_lock2 and
svn_repos_fs_unlock2 to dual pool.

* subversion/include/svn_repos.h
  (svn_repos_fs_lock2,
   svn_repos_fs_unlock2): Add second pool.

* subversion/libsvn_repos/fs-wrap.c
  (svn_repos_fs_lock2,
   svn_repos_fs_unlock2): Convert to dual pool, introduce an iteration pool.

* subversion/libsvn_ra_local/ra_plugin.c
  (svn_ra_local__lock,
   svn_ra_local__unlock): Pass second pool.

* subversion/svnserve/serve.c
  (lock_many,
   unlock_many): Pass second pool.


git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/fsfs-lock-many@1572013 13f79535-47bb-0310-9956-ffa450edef68