Commit 10801f36 (page-server: don't return a server pid from
page-server) broke page-server starting via RPC -- the latter
code checks for return value being <=0 as failure.
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>