Allow DSM segments to be created as pinned

dsm_create and dsm_attach assumed that a current resource owner was
always in place.  Exploration with the API show that this is
inconvenient: sometimes one must create a dummy resowner, create/attach
the DSM, only to pin the mapping later, which is wasteful.  Change
create/attach so that if there is no current resowner, the dsm is
effectively pinned right from the start.

Discussion: https://postgr.es/m/[email protected]
Reviewed by Thomas Munro.

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