This patch introduces and integrates Oslo-Versioned Objects for
IpamAllocationPool,IpamAllocation and IpamSubnet model classes.
Change-Id: Ib7d86dd10e92b5e2baeef0e69620c8688859fe7d
Partially-Implements: blueprint adopt-oslo-versioned-objects-for-db
Co-Authored-By: Anindita Das <anindita.das@intel.com>
Co-Authored-By: Mohit Malik <mohit.malik@intel.com>
Co-Authored-By: Victor Morales <victor.morales@intel.com>