In the svn_repos commit editor, make sure that close_edit() and
abort_edit() release all internal objects.  This relaxes pool
usage constraints.

* subversion/libsvn_repos/commit.c
  (close_edit,
   abort_edit): Close FS layer objects that we own.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1555499 13f79535-47bb-0310-9956-ffa450edef68