add classify session action set-sr-policy-index

This allows to use the classifier to steer source routing packets instead
of using the "sr steer" command.
This way we can steer on anything instead of only the dst ip address.

test:
 * add add_node_next function to the VppPapiProvider class.
 * add simple test scenario using the classifier to steer packets with
   dest ip addr == a7::/8 to the source routing insert node.
 * use new interface indexes (3,4) instead of (0,1) to prevent a cleanup
   conflict with the other tests which attach a specific fib to the
   interface.

The test creates interfaces sepsrated from the other tests to prevent a
conflict in the cleaning of the ip6 fib index 1 which causes vpp not to
be able to find a default route on this table.

Change-Id: Ibacb30fab3ce53f0dfe848ca6a8cdf0d111d8336
Signed-off-by: Gabriel Ganne <gabriel.ganne@enea.com>
diff --git a/src/vnet/classify/classify.api b/src/vnet/classify/classify.api
index de9de77..9d666ee 100644
--- a/src/vnet/classify/classify.api
+++ b/src/vnet/classify/classify.api
@@ -90,8 +90,13 @@
            2: Classified IP packets will be looked up from the
               specified ipv6 fib table (configured by metadata as VRF id).
               Only valid for L3 input ACL node
+           3: Classified packet will be steered to source routig policy
+              of given index (in metadata).
+              This is only valid for IPv6 packets redirected to a source
+              routing node.
     @param metadata - valid only if action != 0
            VRF id if action is 1 or 2.
+           sr policy index if action is 3.
     @param match[] - for add, match value for session, required
 */
 autoreply define classify_add_del_session