srm: Enable legacy GSI close by default

We have only recently released a client for close works, so it is
wise to enable legacy close by default.

Target: trunk
Request: 2.11
Require-notes: no
Require-book: no
Acked-by: Paul Millar <paul.millar@desy.de>
Patch: https://rb.dcache.org/r/7452/
(cherry picked from commit a8c0c7e79ca1bc2b778223f4272d17633049c1d4)