Alexander V. Chernikov 0abb6ff590 fib algo: do not reallocate datapath index for datapath ptr update.
Fib algo uses a per-family array indexed by the fibnum to store
 lookup function pointers and per-fib data.

Each algorithm rebuild currently requires re-allocating this array
 to support atomic change of two pointers.

As in reality most of the changes actually involve changing only
 data pointer, add a shortcut performing in-flight pointer update.

MFC after:	2 weeks
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