Updated how the samba container id is being fetched.

[kpettijohn]

I ran into a issue on my install of debian jessie where the container would fail to start due to sambaContainer returning empty.

It turns out that /proc/1/cgroup is formated a bit differently on my host.

3:cpu,cpuacct:/system.slice/docker-5d55e2c82e9782e76a993b1edaa958817a4e99457756c8acef923e8c1e9fee21.scope

I verified that the changes work with the current boo2docker vm along with the previous match grep cpu: /proc/1/cgroup | sed 's/.*\docker\///'

[m-abs]

I'm having the same issue

[SvenDowideit]

works for me - merging.