Log Message:
-----------
lxc/conf: handle rootfs open_at error in lxc_mount_rootfs
If LXC build is misconfigured, for instance, --prefix=/
and /lib is a symlink to /usr/lib then open_at always fails
to open rootfs. Let's add error print to make it easier to
figure out this.
Log Message:
-----------
lxc/caps: fix open /proc/sys/kernel/cap_last_cap
Since 7418b27f1 ("tree-wide: use __u32 for capabilities") open
/proc/sys/kernel/cap_last_cap never worked, it was failing with
EXDEV and we were using a fallback codepath to get a last cap.