service: page-server: allow requesting page-server without setting any ps_info
service: page-server: allow requesting page-server without setting any ps_info

Since we now can return port to user in autobind case, it's ok to request
page-server without setting ps_info.

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

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