Fix flowhash size computation for very large hash tables
Fix flowhash size computation for very large hash tables

Change-Id: Ieae4ff6429fc5bdcf0e243db40ab7ec00c30730a
Signed-off-by: Pierre Pfister <e31bfcc197987a594da168a19bf32d37137e11a7@cisco.com>

vpp-dev/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,vpp-dev/vpp,vpp-dev/vpp,FDio/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,FDio/vpp,vpp-dev/vpp,vpp-dev/vpp,vpp-dev/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,chrisy/vpp,vpp-dev/vpp,FDio/vpp,FDio/vpp,chrisy/vpp