While reusing deliverer API as a blocks event source at peer we need to
lookup for correct policy name based on the RSCC resource API definition
name. This commit adds a factory method which introduces level of
indirection to allow lookup of correct policy name based on the deliver
API initialization handler.

Change-Id: Ib896736793722549f035cca9e0b6a4c871050615
Signed-off-by: Artem Barger <bartem@il.ibm.com>