Use IPOpt and PortOpt
Use IPOpt and PortOpt

IPOpt/PortOpt have been added to oslo.config to provide higher level
validation than StrOpt/IntOpt. This change uses them when possible.

This change also updates oslo.config version requirement to match
OpenStack global requirements.

Change-Id: I598faf980150a902ca978e8fda622ef90f064824
Depends-On: Iab34d66b1c12deb53dc5c302db88d8726cabc88c

openstack/cloudkitty,muraliselva10/cloudkitty,stackforge/cloudkitty,openstack/cloudkitty,muraliselva10/cloudkitty,stackforge/cloudkitty