bpf_trace_filter: support bpf filter optimization and dump

bpf_trace_filter: support bpf filter optimization and dump

BPF filter w/o optimization can take x2 - x3 more instructions,
causing significant slow down in fast path.

Enable pcap optimization by default via cli and introduce api v2
with pcap optimization control, keep v1 for a while as it exists
in previous release already.
Intriduce bpf filter cli dump, similar to tcpdump -d.

Also fix memleak, function name typo, cli pcap format hint and
add related tests.

Type: improvement
Signed-off-by: Vladislav Grishenko <themiron@yandex-team.ru>
Change-Id: I92b2b519e92326f1b8e1a4dda6a3e3edc52f87ad