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

As a consequence of the cgroup layout changes from commit 'cfed9ad4', the
lxcDomainGetSchedulerParameters[Flags]()' and lxcGetSchedulerType() 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.

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