When libcontainer was added it was apparently not actually the version
of libcontainer it portends to be.  One line was removed from
libcontainer in Godeps which is present in the upstream tree.

This was likely done as it required a definition in a different package
which was not in our tree (and was vendored into libcontainer upstream)

We would be wise to have a test to see if package versions in Godep are
actually the packages they say they are...