An unprivileged process cannot reduce its own capability bounding set,
hence, while it is nice to reduce the set, let's not log about it
loudly, in case we are invoked unpriv (which we explicity support these
days after all).
An unpriv process also cannot detach from its netns, hence also
downgrade the warning to a debug message.
Lennart Poettering
25dbf586b2