libvirtd: Add service dependency on systemd-logind
libvirtd: Add service dependency on systemd-logind

At daemon startup we query logind for host PM support status. Without
a service dependency host startup can trigger libvirtd errors like:

error : virNodeSuspendSupportsTarget:336 : internal error: Cannot probe for
supported suspend types
warning : virQEMUCapsInit:949 : Failed to get host power management
capabilities

https://bugzilla.redhat.com/show_bug.cgi?id=1588288

Reviewed-by: Andrea Bolognani <3ada0bee826c753786fdbba72243dfba997094cf@redhat.com>
Signed-off-by: Cole Robinson <7cd45ff6ad1fb7cf556a02797d774247851499f8@redhat.com>

nertpinx/libvirt,olafhering/libvirt,jardasgit/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt,andreabolognani/libvirt,crobinso/libvirt,nertpinx/libvirt,jfehlig/libvirt,andreabolognani/libvirt,jardasgit/libvirt,fabianfreyer/libvirt,eskultety/libvirt,eskultety/libvirt,libvirt/libvirt,nertpinx/libvirt,nertpinx/libvirt,crobinso/libvirt,fabianfreyer/libvirt,jardasgit/libvirt,fabianfreyer/libvirt,zippy2/libvirt,jfehlig/libvirt,libvirt/libvirt,crobinso/libvirt,eskultety/libvirt,zippy2/libvirt,libvirt/libvirt,jardasgit/libvirt,jfehlig/libvirt,jardasgit/libvirt,andreabolognani/libvirt,olafhering/libvirt,nertpinx/libvirt,olafhering/libvirt,jfehlig/libvirt,zippy2/libvirt,andreabolognani/libvirt,eskultety/libvirt,eskultety/libvirt,libvirt/libvirt,crobinso/libvirt,olafhering/libvirt,fabianfreyer/libvirt,zippy2/libvirt