Prime system blueprint from wait-vpd-parsers

This commit updates wait-vpd-parsers to prime system blueprint.
As part of PST VPD collection flow, priming inventory objects needs to
be triggered as a

Prime system blueprint from wait-vpd-parsers

This commit updates wait-vpd-parsers to prime system blueprint.
As part of PST VPD collection flow, priming inventory objects needs to
be triggered as a part of systemd target, instead of being triggered by
vpd-manager.
This commit only implements only stub APIs under PrimeInventory class.

Change-Id: I144b13192e9ce39461c331c51ed7d4d9e952809c
Signed-off-by: Anupama B R <anupama.b.r1@ibm.com>

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