qemuhotplugtest: Resolve some memleaks
qemuhotplugtest: Resolve some memleaks

If testQemuHotplugAttach succeeds, the vm->def steals the dev pointer.
However, not the envelope, which needs to be freed. In addition,
driver.config is allocated, but never freed.

eskultety/libvirt,taget/libvirt,zippy2/libvirt,olafhering/libvirt,datto/libvirt,rlaager/libvirt,zippy2/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,jardasgit/libvirt,taget/libvirt,jfehlig/libvirt,taget/libvirt,zhlcindy/libvirt-1.1.4-maintain,zippy2/libvirt,zippy2/libvirt,zhlcindy/libvirt-1.1.4-maintain,rlaager/libvirt,cbosdo/libvirt,jardasgit/libvirt,fabianfreyer/libvirt,rlaager/libvirt,agx/libvirt,shugaoye/libvirt,nertpinx/libvirt,taget/libvirt,fabianfreyer/libvirt,VenkatDatta/libvirt,rlaager/libvirt,rlaager/libvirt,taget/libvirt,nertpinx/libvirt,andreabolognani/libvirt,andreabolognani/libvirt,andreabolognani/libvirt,jardasgit/libvirt,jardasgit/libvirt,VenkatDatta/libvirt,VenkatDatta/libvirt,libvirt/libvirt,datto/libvirt,agx/libvirt,shugaoye/libvirt,zhlcindy/libvirt-1.1.4-maintain,olafhering/libvirt,andreabolognani/libvirt,datto/libvirt,elmarco/libvirt,zhlcindy/libvirt-1.1.4-maintain,fabianfreyer/libvirt,agx/libvirt,elmarco/libvirt,shugaoye/libvirt,elmarco/libvirt,agx/libvirt,crobinso/libvirt,datto/libvirt,andreabolognani/libvirt,cbosdo/libvirt,olafhering/libvirt,elmarco/libvirt,olafhering/libvirt,eskultety/libvirt,shugaoye/libvirt,jfehlig/libvirt,VenkatDatta/libvirt,VenkatDatta/libvirt,jfehlig/libvirt,jfehlig/libvirt,cbosdo/libvirt,eskultety/libvirt,elmarco/libvirt,libvirt/libvirt,libvirt/libvirt,cbosdo/libvirt,shugaoye/libvirt,crobinso/libvirt,nertpinx/libvirt,eskultety/libvirt,eskultety/libvirt,cbosdo/libvirt,crobinso/libvirt,agx/libvirt,nertpinx/libvirt,jardasgit/libvirt,libvirt/libvirt,crobinso/libvirt,fabianfreyer/libvirt,zhlcindy/libvirt-1.1.4-maintain,datto/libvirt