nfs-proxy: kill mover on close

kill the mover on close if we did not have an
established data connection yet.

kill mover if we have failed to get a redirect within a
defined time window

Acked-by: Gerd Behrmann
Target: master, 2.11, 2.10, 2.9, 2.8, 2.7, 2.6
Require-book: no
Require-notes: no
(cherry picked from commit 7c3d400b656b2531c1f19701d7ad96707aa65e89)
Signed-off-by: Tigran Mkrtchyan <tigran.mkrtchyan@desy.de>
Merge pull request #1025 from kofemann/fix-nfs-proxy-2.11

nfs-proxy: kill mover on close