Implement 1-way connection between routing-instances

[Nischal Sheth]

This is required for multi-policy service chains.

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/15468
Submitter: Nischal Sheth (<email address hidden>)

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/15551
Submitter: Sachin Bansal (<email address hidden>)

[OpenContrail Admin (ci-admin-f)]

Reviewed: https://review.opencontrail.org/15551
Committed: http://github.org/Juniper/contrail-controller/commit/62670fee025742548d6756c6a8207c2f5b4ddf54
Submitter: Zuul
Branch: master

commit 62670fee025742548d6756c6a8207c2f5b4ddf54
Author: Sachin Bansal <email address hidden>
Date: Wed Dec 2 11:37:39 2015 -0800

Resolve name conflict for ConnectionType

The name ConnectionType is used in process_info.sandesh and also in schema for
connection between routing instances. This causes a problem when the definition
is changed for one of them. We need to resolve the conflict by importing as a
different Name.

Change-Id: I478aa11b325d6ea0c176bc5f745a058baa03be85
Related-Bug: 1518033

[OpenContrail Admin (ci-admin-f)]

Reviewed: https://review.opencontrail.org/15468
Committed: http://github.org/Juniper/contrail-controller/commit/109b987b2614d8aeec8793cb297c8945ebacdc72
Submitter: Zuul
Branch: master

commit 109b987b2614d8aeec8793cb297c8945ebacdc72
Author: Nischal Sheth <email address hidden>
Date: Thu Nov 26 22:57:16 2015 -0800

Allow unidirectional connections between routing instances

Add a destination-instance field to ConnectionType to specify the
direction of a connection. An empty value is used to indicate a
bidirectional connection. If there's a connection betwen RI-A and
RI-B and the destination-instance is set to RI-A, then routes are
imported from RI-B into RI-A, but not in the other direction.

Highlights:

- Schema change to make connection a link with properties
- Modify ifmap config code to take above schema changes into account
- Update dependency tracker policy in bgp_config_listener.cc
- Update and enhance tests in bgp_config_listener_test.cc
- Enhance tests in bgp_config_test.cc

Change-Id: Ic4d40df47af57b8bf990a7d3020ec7f70dc858d0
Closes-Bug: 1518033