CA-94829: Set the TCP timeout properties on the migration fd

TAMPA-LCM: HFX 671

Signed-off-by: Jon Ludlam <jonathan.ludlam@eu.citrix.com>

Conflicts:
	ocaml/xenguest/xenguest_main.ml

Signed-off-by: Jerome Maloberti <jerome.maloberti@citrix.com>