Custom tempest configuration for libvirt-lxc

In order to support continuing testing of the libvirt driver
for the lxc virtualization type, a selection of compute features
must be disabled, including allow_tenant_isolation, rescue, resize,
suspend, and xml_api_v2.
Temp
Merge branch 'libvirt-lxc-tempest-customization' of https://github.com/nelsnelson/devstack into libvirt-lxc-tempest-customization

Conflicts:
	lib/tempest