[apic_aim] Refactor redundant AIM mapping code
Eliminate redundant code that performs name mapping and creates AIM
resource identity objects by moving this to _map_network, _map_subnet,
_map_address_scope, and _map_router mechanism driver methods.
Change-Id: I0cc5056e812ed446af21adf06ad27026601e1d82
(cherry picked from commit 3306efd31d)
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