service: use send_criu_pre_dump_resp() in pre_dump_using_req()
service: use send_criu_pre_dump_resp() in pre_dump_using_req()

Currently we have a bug, service sends resp of type PRE_DUMP
instead of DUMP. So lets introduce send_criu_pre_dump_resp() and
use it.

Signed-off-by: Ruslan Kuprieiev <f6538312ce47017d734b1357aabc970ebf896e32@gmail.com>
Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@parallels.com>

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