Recent changes in Nova [0] remove a number of parameters from the
InstanceInfo object; re-align the nova-lxd driver to not provide
these values when constructing this object.
Also add chown & chmod to rootwrap configuration file until
nova-lxd moves to using privsep rather than rootwrap.
Include minor change to .testr.conf to deal with switch to
stestr (via os-testr).
[0] I5fe5c8121800e2b8da0860d53d818b7bd83c9e9d
Change-Id: I21caccaeb8794d1ee82956bd8c897b3f1cc366b0
Alex Kavanagh