avagin / criu

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LAST BUILD ON BRANCH netns_ext2

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criu: add support for external net namespaces

It works like other external resources.
A user specify which namespaces are external and have not to be dumped.
On restore, the user gives file descriptors to preconfigured namespaces.

How to use:
dump:
	--external net[INO]:KEY
restore:
	--inherit-fd fd[NSFD]:KEY

The test script contains more details how to use this:
test/others/netns_ext/run.sh

Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>