Next step in consolidating the IP fragment management

This set concerns the xxx_find() routine only. This one
is used to obtain the fragment queue depending on some
criteria, and this can be consolidated.

The consolidation goes step-by-step, consolidating one
sub-routine at a time, so some functions, exports and 
callbacks that are introduced in patches are temporary
and are removed in some subsequent patch.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
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