Prepare for the unshare support of the pid namespace

[Daniel Lezcano]

This patchset is a cleanup and a preparation to unshare the pid
namespace. These prerequisites prepares the next Eric's patchset
to give a file descriptor to a namespace and join an existing
namespace.

The initial authors of this patchset are Eric Biederman and Oleg
Nesterov.

Changelog:
	01/31/11 - Daniel Lezcano <daniel.lezcano@xxxxxxx>
	* patch 1/4 : wrapped test in a function
	* other patches : refreshed against linux-next


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