It turns out that when we want to put a repo under complete lockdown,
i.e. take out all locks, there is no need to sometimes allow new txns
to be created.

* subversion/libsvn_fs_fs/fs_fs.h
  (svn_fs_fs__with_all_locks): Remove allow_new_txns parameter.

* subversion/libsvn_fs_fs/fs_fs.c
  (svn_fs_fs__with_all_locks): One option less.
  (svn_fs_fs__upgrade): Update caller.

* subversion/libsvn_fs_fs/recovery.c
  (svn_fs_fs__recover): Same.

* subversion/libsvn_fs_fs/hotcopy.c
  (svn_fs_fs__hotcopy): Same. There is no need to allow new txns in
                        the target repo while hotcopying.

git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1589250 13f79535-47bb-0310-9956-ffa450edef68