cgroupv2: ebpf: debug info when detaching programs in fallback mode
cgroupv2: ebpf: debug info when detaching programs in fallback mode

It seems that we are triggering the mutli-attach fallback in the fedora
CI, but we don't have enough debugging information to really know what's
going on, so add some. Unfortunately the amount of information we have
available with eBPF programs in general is fairly limited (we can't get
their bytecode for instance).

We also demote the "more than one filter" warning to an info message
because it happens very often under the systemd cgroup driver (likely
when systemd configures the cgroup it isn't deleting our old program, so
when our apply code runs after the systemd one there are two running
programs).

Signed-off-by: Aleksa Sarai <b305c9b0212d6145eea67bbffd24e29cb79c759c@cyphar.com>

kolyshkin/runc,dqminh/runc,rhatdan/runc,opencontainers/runc,dqminh/runc,opencontainers/runc,kolyshkin/runc,rhatdan/runc,kolyshkin/runc,dqminh/runc,opencontainers/runc,opencontainers/runc,rhatdan/runc,rhatdan/runc,kolyshkin/runc,dqminh/runc