Updated cgsnapshot to show multiple mount points of hierarchies.
Updated cgsnapshot to show multiple mount points of hierarchies.

Take advantage of the new API and show all mount points in cgsnapshot output.

Signed-off-by: Jan Safranek <a7f4b96ffdd515ecef00f117294da18555749b0b@redhat.com>
Acked-by: Ivana Hutarova Varekova<2e3918a0a366ea7e658a2062ab582c898a7e1b1b@redhat.com>

jrfastab/Linux-cgdcbxd,rafalmiel/libcg,jrfastab/Linux-cgdcbxd,rafalmiel/libcg,rafalmiel/libcg,jrfastab/Linux-cgdcbxd,rafalmiel/libcg,jrfastab/Linux-cgdcbxd