Use oslo_config IPOpt support
Use oslo_config IPOpt support

The oslo_config library provides IPOpt type.

Closes-Bug: #1510004
Change-Id: I8f8c69e81a8cca63222da97bcede00bd31c92c8d

openstack/magnum,ArchiFleKs/magnum,openstack/magnum,dimtruck/magnum,dimtruck/magnum,ArchiFleKs/magnum,jay-lau/magnum