user namespaces: continue targetting capabilities

Hi,

here is a set of patches to continue targetting capabilities
where appropriate.  This set goes about as far as is possible
without making the VFS user namespace aware, meaning that the
VFS can provide a namespaced view of userids, i.e init_user_ns
sees file owner 500, while child user ns sees file owner 0 or
1000.

With this set applied, you can create and configure veth netdevs
if your user namespace owns your network namespace (and you are
privileged), but not otherwise.

Some simple testcases can be found at
https://code.launchpad.net/~serge-hallyn/+junk/usernstests with
packages at https://launchpad.net/~serge-hallyn/+archive/userns-natty

Feedback very much appreciated.

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