Fix detection of AUFS layers.
Fix detection of AUFS layers.

We were using the container name instead of the Docker ID which breaks
in systemd systems.

Fixes #475.

mangalaman93/cadvisor,bowlofstew/cadvisor,BrickXu/cadvisor,guoshimin/cadvisor,vegasbrianc/cadvisor,jimmidyson/cadvisor,IFTTT/cadvisor,CrazyJvm/cadvisor,derekwaynecarr/cadvisor,yolkov/cadvisor,bing6/cadvisor,jmaitrehenry/cadvisor,hw-qiaolei/cadvisor,jimmidyson/cadvisor,vishh/cadvisor,rajthilakmca/cadvisor,ainsleyc/cadvisor,vegasbrianc/cadvisor,carmark/cadvisor,vishh/cadvisor,dchen1107/cadvisor,guoshimin/cadvisor,pwittrock/cadvisor,normanjoyner/cadvisor,kmicheal/cadvisor,derwolfe/cadvisor,megamsys/cadvisor,pwittrock/cadvisor,mr-justin/cadvisor,bpradipt/cadvisor,jhjeong-kr/cadvisor,dchen1107/cadvisor,Snorch/cadvisor,hzy001/cadvisor,ChengTiesheng/cadvisor,erSitzt/cadvisor,normanjoyner/cadvisor,derwolfe/cadvisor,cnaize/cadvisor,mr-justin/cadvisor,BrickXu/cadvisor,datawisesystems/cadvisor,c-st/cadvisor,jmaitrehenry/cadvisor,wulonghui/cadvisor,bowlofstew/cadvisor,hacpai/cadvisor,anarcher/cadvisor,datawisesystems/cadvisor,dchen1107/cadvisor,timstclair/cadvisor,linux-on-ibm-z/cadvisor,jimonreal/cadvisor,hzy001/cadvisor,mesosphere/cadvisor,takecy/cadvisor,jhjeong-kr/cadvisor,shilpamayanna/cadvisor,dalanlan/cadvisor,dchen1107/cadvisor,IFTTT/cadvisor,carmark/cadvisor,difro/cadvisor,ncdc/cadvisor,erSitzt/cadvisor,BrickXu/cadvisor,BrickXu/cadvisor,CrazyJvm/cadvisor,ncdc/cadvisor,f0/cadvisor,vmarmol/cadvisor,anarcher/cadvisor,jhjeong-kr/cadvisor,jzaefferer/cadvisor,bing6/cadvisor,hzy001/cadvisor,guoshimin/cadvisor,mr-justin/cadvisor,ainsleyc/cadvisor,timstclair/cadvisor,derwolfe/cadvisor,f0/cadvisor,jimonreal/cadvisor,takecy/cadvisor,derekwaynecarr/cadvisor,feiskyer/cadvisor,aivarasko/cadvisor,whosthatknocking/cadvisor,bowlofstew/cadvisor,difro/cadvisor,takecy/cadvisor,difro/cadvisor,mangalaman93/cadvisor,vmarmol/cadvisor,afein/cadvisor,wulonghui/cadvisor,yifan-gu/cadvisor,ainsleyc/cadvisor,ncdc/cadvisor,morpheyesh/cadvisor,jzaefferer/cadvisor,anarcher/cadvisor,hw-qiaolei/cadvisor,yolkov/cadvisor,jhjeong-kr/cadvisor,kmicheal/cadvisor,derekwaynecarr/cadvisor,Snorch/cadvisor,atyenoria/cadvisor,hacpai/cadvisor,Clever/cadvisor,yifan-gu/cadvisor,f0/cadvisor,ChengTiesheng/cadvisor,cnaize/cadvisor,aivarasko/cadvisor,derekwaynecarr/cadvisor,bpradipt/cadvisor,kmicheal/cadvisor,afein/cadvisor,vmarmol/cadvisor,timstclair/cadvisor,pwittrock/cadvisor,jmaitrehenry/cadvisor,feiskyer/cadvisor,BrickXu/cadvisor,linux-on-ibm-z/cadvisor,erSitzt/cadvisor,whosthatknocking/cadvisor,c-st/cadvisor,derekwaynecarr/cadvisor,linux-on-ibm-z/cadvisor,IFTTT/cadvisor,jhjeong-kr/cadvisor,megamsys/cadvisor,morpheyesh/cadvisor,jimmidyson/cadvisor,yifan-gu/cadvisor,atyenoria/cadvisor,jimonreal/cadvisor,vegasbrianc/cadvisor,hw-qiaolei/cadvisor,ncdc/cadvisor,rajthilakmca/cadvisor,f0/cadvisor,whosthatknocking/cadvisor,Clever/cadvisor,wulonghui/cadvisor,ncdc/cadvisor,jzaefferer/cadvisor,rajthilakmca/cadvisor,Clever/cadvisor,mesosphere/cadvisor,cnaize/cadvisor,ChengTiesheng/cadvisor,dalanlan/cadvisor,CrazyJvm/cadvisor,vishh/cadvisor,dchen1107/cadvisor,shilpamayanna/cadvisor,erSitzt/cadvisor,dalanlan/cadvisor,IFTTT/cadvisor,hacpai/cadvisor,ainsleyc/cadvisor,yolkov/cadvisor,bpradipt/cadvisor,c-st/cadvisor,Snorch/cadvisor,aivarasko/cadvisor,IFTTT/cadvisor,atyenoria/cadvisor,feiskyer/cadvisor,bing6/cadvisor,mesosphere/cadvisor,mangalaman93/cadvisor,erSitzt/cadvisor,f0/cadvisor