fib: fix adj pool expand cases
fib: fix adj pool expand cases

adj_alloc (...) is not thread safe when the adj pool or combined
counter vectors expand.

Type: fix

Signed-off-by: Dave Barach <bfcdf3e6ca6cef45543bfbb57509c92aec9a39fb@barachs.net>
Change-Id: I55710de6ecc083b7434e11798659cca9250c9131

chrisy/vpp,FDio/vpp,FDio/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp