Revert "use a default per-container logfile"

The logfile changes broke lxc-info and possibly more command line
tools. Revert for now until we get those issues addressed.

This reverts commit b8e0503a1d1dbf3a508bf6f34521606ba231b1fe.
Revert "use a default per-container logfile"

The logfile changes broke lxc-info and possibly more command line
tools. Revert for now until we get those issues addressed.

This reverts commit 74476cf144523530022d76cef3a558b0662b592f.