Advertise origin vn for each ecmp path in xmpp

[Nischal Sheth]

Current implementation advertises the origin vn as a property of the
route. Some service chaining uses cases require this field for each ecmp
path.

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/15653
Submitter: Nischal Sheth (<email address hidden>)

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/15719
Submitter: Ananth Suryanarayana (<email address hidden>)

[OpenContrail Admin (ci-admin-f)]

Reviewed: https://review.opencontrail.org/15653
Committed: http://github.org/Juniper/contrail-controller/commit/6f2349653e1f050d90ceec198a3e70b5e5ccbdb0
Submitter: Zuul
Branch: master

commit 6f2349653e1f050d90ceec198a3e70b5e5ccbdb0
Author: Nischal Sheth <email address hidden>
Date: Thu Dec 3 15:01:00 2015 -0800

Advertise origin vn for each ecmp path in xmpp

This capability is required for advanced service chaining use cases
where the same route is learnt from 2 or more service chains. An ACL
tells the vRouter which chain to use for given flow.

Temporarily disable xmpp_ecmp_test. Ananth is working on updating it
to properly handle multiple origin vns for a path and not resuse the
same label for in different VRFs.

Highlights:

- Schema channge to add virtual-network to NextHopType
- Move some code from bgp_ribout.h to bgp_ribout.cc
- Get rid of vrf_originated_ field in RibOutAttr
- Encode the origin_vn_index in each NextHop
- An origin_vn_index of 0 says that path is vrf originated
- XmppMessageBuilder translates origin_vn_index to a name
- Sprinkle const in a few places
- Add integration tests to verify new functionality

Change-Id: I72c8aab47ba1ab9141a811a89a93ed22114802e4
Closes-Bug: 1518034

[OpenContrail Admin (ci-admin-f)]

Reviewed: https://review.opencontrail.org/15719
Committed: http://github.org/Juniper/contrail-controller/commit/d05fb65127f465917a7de6e5488824ed76a3b9f3
Submitter: Zuul
Branch: master

commit d05fb65127f465917a7de6e5488824ed76a3b9f3
Author: Ananth Suryanarayana <email address hidden>
Date: Wed Dec 9 14:57:07 2015 -0800

Set virtual_network in nexthops and verify them in xmpp_ecmp_test

Also, as the test found out, remove possibility of duplicate next-hops
by retrieving origin_network from the table and encode in RibOutAttr::NextHop
structure, instead of encoding 0.

Change-Id: I333597ae3920abb8af04010bb2620e9599562df5
Closes-Bug: 1518034