Add flow support for IPv6

[Prabhakaran Ganesan]

IPv6 packets are only getting routed in the vrouter. Allow flows to be created for V6 traffic so that policies can be supported and flow stats can be reported.

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/8343
Submitter: Prabhakaran Ganesan (<email address hidden>)

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/8618
Submitter: Ashok Singh (<email address hidden>)

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/8343
Submitter: Prabhakaran Ganesan (<email address hidden>)

[Prabhakaran Ganesan (gprabhak)]

Ashok,

    The vrouter-side changes are reviewed, please commit them along with your agent-side changes.

Thanks
Prabhakar

[OpenContrail Admin (ci-admin-f)]

Reviewed: https://review.opencontrail.org/8618
Committed: http://github.org/Juniper/contrail-controller/commit/113cbc7e0d3870853d2ff3919d5e990168636a9d
Submitter: Zuul
Branch: master

commit 113cbc7e0d3870853d2ff3919d5e990168636a9d
Author: ashoksingh <email address hidden>
Date: Wed Mar 25 12:24:29 2015 +0530

Agent IPv6 flow changes

Change-Id: I7d0b5bc164a2ec1a86cee29fc182a74c0ef2cf30
Partial-Bug: #1398625

[OpenContrail Admin (ci-admin-f)]

Reviewed: https://review.opencontrail.org/8343
Committed: http://github.org/Juniper/contrail-vrouter/commit/c387561eb84007cbf6b497720987ab3a45beec2e
Submitter: Zuul
Branch: master

commit c387561eb84007cbf6b497720987ab3a45beec2e
Author: Ganesan Prabhakaran <email address hidden>
Date: Fri Mar 13 16:12:11 2015 -0700

The following changes are made to support flow-lookup for IPv6.
1. Change vr_flow Sandesh message to include family (AF_INET/AF_INET6) and <list> for IP addresses (instead of uint32 for SrcIP and DstIP). The list of IP address will pack both SrcIP and Dst IP (8 bytes for IPv4 and 32 bytes for IPv6, identified by the family field .
2. Defined a 'union' to describe how the flow entry looks for V4 and V6.
3. Added flow_key data structure for V6 addresses. Changed order of fields in flow_key (moved IP addresses to the end), added #defines to access generic/V4/V6 fileds in the flow_key
4. Updated hash/lookup logic to use different key size based on key_family.
5. Other related changes in dp-core and utils

Change-Id: I0147c54b8e5a8f5a046a097a39581c899fa6f972
Closes-bug: 1398625

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/9166
Submitter: Ashok Singh (<email address hidden>)

[OpenContrail Admin (ci-admin-f)]

Reviewed: https://review.opencontrail.org/9166
Committed: http://github.org/Juniper/contrail-vrouter/commit/a239ab2750b89fe38e4d6f7d7b7f6973325193e1
Submitter: Zuul
Branch: master

commit a239ab2750b89fe38e4d6f7d7b7f6973325193e1
Author: ashoksingh <email address hidden>
Date: Wed Apr 15 22:27:24 2015 +0530

Addressed code review inputs

(On behalf of Prabhakar)
Closes-Bug: #1398625

Change-Id: I46a313dc3b9b527b38078fc348051ad96b43f37f