Make VXLAN highest in default encapsulation priority list

[Nischal Sheth]

Current default encap priority list is MPLS-o-UDP, MPLS-o-GRE, VXLAN.
We should change this to VXLAN, MPLS-o-UDP, MPLS-o-GRE starting 2.20.

Since we're officially going to support only VXLAN encap with MX for
EVPN (due to issues in MX IRB behavior for EVPN with MPLS encap), it
will be good to change the default encapsulation priorities so that
VXLAN is the highest. Without this change, the user needs to remember
to change priority in Contrail in order to get EVPN to interoperate
correctly with MX, even when the device-manager configures MX.

Also, since 2.20 will be the first general release where we switch to
to proper IRB model, it will be a good idea to switch to using VXLAN
(as opposed to MPLS-o-UDP encap) for intra-subnet traffic.

Note that intra-subnet traffic uses EVPN MAC based forwarding with
MPLS-o-UDP encaps currently. After this change it will end up using
EVPN MAC based forwarding with VXLAN encap.

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/9393
Submitter: Manish Singh (<email address hidden>)

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/9394
Submitter: Manish Singh (<email address hidden>)

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/9863
Submitter: Manish Singh (<email address hidden>)

[OpenContrail Admin (ci-admin-f)]

Reviewed: https://review.opencontrail.org/9863
Committed: http://github.org/Juniper/contrail-puppet/commit/7e2b979387bc7c8e8e00347e693da6c8b951cb80
Submitter: Zuul
Branch: R2.20

commit 7e2b979387bc7c8e8e00347e693da6c8b951cb80
Author: Manish <email address hidden>
Date: Mon May 4 15:25:28 2015 +0530

Move VXLAN to the highest priority in encapsulation list.

With support of EVPN, VXLAN will be the only supported encap for intra-subnet
traffic (i.e. bridge). So push VXLAN at highest priority.
Layer3 will continue using MPLS encapsulation only.

Change-Id: I4ef0fe906d9b791e168c7032fa38ca1d0e624aa9
Closes-bug: 1446762

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/9950
Submitter: Manish Singh (<email address hidden>)

[OpenContrail Admin (ci-admin-f)]

Reviewed: https://review.opencontrail.org/9950
Committed: http://github.org/Juniper/contrail-puppet/commit/d6fad0f2a65e429499448a2baba1f19c7a4f252a
Submitter: Zuul
Branch: master

commit d6fad0f2a65e429499448a2baba1f19c7a4f252a
Author: Manish <email address hidden>
Date: Mon May 4 15:25:28 2015 +0530

Move VXLAN to the highest priority in encapsulation list.

With support of EVPN, VXLAN will be the only supported encap for intra-subnet
traffic (i.e. bridge). So push VXLAN at highest priority.
Layer3 will continue using MPLS encapsulation only.

Change-Id: I4ef0fe906d9b791e168c7032fa38ca1d0e624aa9
Closes-bug: 1446762