ip: fix ip table allocation randomness
ip: fix ip table allocation randomness

This prevents going through the same sequence every time the api is
called.

Type: fix
Change-Id: I3ca3587ab5d1c060e2913ca88501b8dbcdd9c196
Signed-off-by: Aloys Augustin <d6b8501f412613ec57d5e3c9c2f9fadce4147f25@cisco.com>

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