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ARROW-3610: [C++] Add interface to turn stl_allocator into arrow::MemoryPool

First outcome from PyConDE collaboration with @wolfv

Author: Korn, Uwe <Uwe.Korn@blue-yonder.com>

Closes #2837 from xhochy/ARROW-3610 and squashes the following commits:

0dfe4a4a <Korn, Uwe> Remove test that relied on DCHECK
48752fac <Korn, Uwe> Add atomic header at the right place
1a4fb01d <Korn, Uwe> ARROW-3610:  Add interface to turn stl_allocator into arrow::MemoryPool