user namespace: use net->user_ns for some capable calls under net/

Just a partial conversion to show how the previous patch is expected to
be used.

Changelog:
  6/28/11: fix typo in net/core/sock.c
  7/08/11: don't target capability which authorizes module loading

Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>
Cc: Eric W. Biederman <ebiederm@xmission.com>
2 files changed