Improve Keypair error messages in osapi
Improve Keypair error messages in osapi

The KeypairAPI code provides useful error messages that weren't being
percolated back through the OpenStack API. This patch addresses this by using
the original `message` when crafting the HTTPException objects.

References bug 1187952

Change-Id: I786a225010d912d7bfea5c01838ddcf43fd90d53

citrix-openstack-build/oslo.versionedobjects,openstack/oslo.versionedobjects