qemu: Resolve issue with GetScheduler APIs for non running domain
qemu: Resolve issue with GetScheduler APIs for non running domain

As a consequence of the cgroup layout changes from commit '632f78ca', the
qemuDomainGetSchedulerParameters[Flags]()' and qemuGetSchedulerType() APIs
failed to return data for a non running domain.  This can be seen through
a 'virsh schedinfo <domain>' command which returns:

Scheduler      : Unknown
error: Requested operation is not valid: cgroup CPU controller is not mounted

Prior to that change a non running domain would return:

Scheduler      : posix
cpu_shares     : 0
vcpu_period    : 0
vcpu_quota     : 0
emulator_period: 0
emulator_quota : 0

This patch will restore the capability to return configuration only data
for a non running domain regardless of whether cgroups are available.

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