nfs-proxy: kill mover if we get a timeout on redirect

a lite version of 7c3d400b656b2531c1f19701d7ad96707aa65e89

Ticket: #8525
Acked-by:
Target: 2.6
Require-book: no
Require-notes: no
Merge pull request #1044 from kofemann/fix-nfs-proxy

nfs-proxy: kill mover if we get a timeout on redirect