libbpf-tools/oomkill: Add verbose and help option
libbpf-tools/oomkill: Add verbose and help option

Add -v(--verbose) and -h option to oomkill to display libbpf log.

Signed-off-by: Eunseon Lee <167e02a25d3e8e8921779aab2bb5cd2787143c66@lge.com>

iovisor/bcc,iovisor/bcc,iovisor/bcc,iovisor/bcc,iovisor/bcc