Replace DPL::AutoPtr usage (Warp_iri.cpp)

Replace DPL::AutoPtr usage (Warp_iri.cpp)

[Issue#]     N/A
[Problem]    DPL::AutoPtr should replace to use standard library.
[Cause]      After C++11 is enabled, std::unique_ptr and std::shared_ptr is available.
             DPL::AutoPtr isn't necessary to exist in the DPL.
[Solution]   DPL::AutoPtr -> std::unique_ptr, std::shared_ptr
             - Warp_iri.cpp uses DPL::AutoPtr to create iri_struct by iri_parse and iri_destory.
               Replace usage to use std::unique_ptr.
[SCMRequest] N/A

Change-Id: Id4582f21e916661bd8c1d07ad1e5dd0e52b36823