Remove unused 'user' template variable

From a quick look at the hostiry of the container.conf.erb file, it looks like the @user variable was taken out in 3a691201da3019e17795f19ce57efa75e4143b1a .
Merge pull request #4 from jschneiderhan/patch-1

Remove unused 'user' template variable
Removing user from container since it is no longer passed down to
template
Merge pull request #5 from jschneiderhan/remove-user

Removing user from container