pool: Respect LAN port range for internal srmcp transfers

When copying files internally within the same dCache using server side srmCopy,
the actual transfer is done through DCAP. The mover implementing this did not
respect the LAN port range. This patch resolves that problem.

Target: trunk
Request: 2.10
Request: 2.9
Request: 2.8
Request: 2.7
Request: 2.6
Require-notes: yes
Require-book: yes
Acked-by: Karsten Schwank <karsten.schwank@desy.de>
Acked-by: Paul Millar <paul.millar@desy.de>
Patch: https://rb.dcache.org/r/7348/