trinity: add connection support for AF_INET and AF_INET6

Trinity is a syscall fuzz tool for local host testing. But it would also be
very useful to fuzz during established sessions over the network. This patch
add simple connection ability for IPv4/IPv6 so user can use it as a
client/server and simulate as a real environment.

Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>