examples:dns_matching: accept args from user
examples:dns_matching: accept args from user

Accepts arguments from user. This change makes it slightly more
interactive. usage is show with -h option, so no extra documentation
required for understanding the usage.

tuxology/bcc,iovisor/bcc,brendangregg/bcc,iovisor/bcc,mcaleavya/bcc,brendangregg/bcc,brendangregg/bcc,tuxology/bcc,brendangregg/bcc,brendangregg/bcc,iovisor/bcc,mcaleavya/bcc,tuxology/bcc,iovisor/bcc,tuxology/bcc,mcaleavya/bcc,mcaleavya/bcc,tuxology/bcc,mcaleavya/bcc,iovisor/bcc