ACL: Fix next_table_index classifiers consistancy
ACL: Fix next_table_index classifiers consistancy

Fixed consistancy between the first classifier match and the
next_table_index classifier matches:
- CLASSIFY_ACTION_SET_METADATA was applied only for the first
  classifier, but it was not applied for the other classifiers
- Actions should be performed only for input ACLs
- Payload should point at the IP header for output ACLs

Change-Id: Ifbd7791756320ae3198520c41902f5e99e3d40b4
Signed-off-by: Gregory Thiemonge <e52bb817bb81a6a83ac315d175eae60b42d6e3a8@enea.com>

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