tcp: Separate helpers to create ns listening sockets

tcp_sock_init*() can create either sockets listening on the host, or in
the pasta network namespace (with @ns==1).  There are, however, a number
of differences in how these two cases work in practice though.  "ns"
sockets are only used in pasta mode, and they always lead to spliced
connections only.  The functions are also only ever called in "ns" mode
with a NULL address and interface name, and it doesn't really make sense
for them to be called any other way.

Later changes will introduce further differences in behaviour between these
two cases, so it makes more sense to use separate functions for creating
the ns listening sockets than the regular external/host listening sockets.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

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