selinux: mark both IPv4 and IPv6 accepted connection sockets as labeled

The current partial labeling was introduced in 389fb800 ("netlabel:
Label incoming TCP connections correctly in SELinux") due to the fact
that IPv6 labeling was not supported yet at the time.

Signed-off-by: Guido Trentalancia <guido@trentalancia.com>
[PM: properly format the referenced commit ID, adjust subject]
Signed-off-by: Paul Moore <paul@paul-moore.com>