acl-plugin: shrink the L2 classifier tables used for traffic redirect
acl-plugin: shrink the L2 classifier tables used for traffic redirect

The previous iteration of the code used the L2 classifier tables for session storage,
as a result, the table allocations were pretty big. The new ACL plugin
datapath uses the tables just as a redirection mechanism, without adding any
entries. Thus, the tables can be much smaller.

Change-Id: Ieec4a5abf0abda6e513ab4e675f912f14d47e671
Signed-off-by: Andrew Yourtchenko <eb6233fe2fbd585844f4fb8426b53b186ab379b1@gmail.com>

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