rpc: Report PID of restore task on setup-namespaces script

This is the first time restorer gets info back from CRIU
service. At that time it makes perfect sense to report
what PID we're working with.

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
rpc: Add ability to specify veth pairs (--veth-pair option)

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
vdso: Don't search for VDSO page in file mappings

Acked-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>