Maximum permissible value for VNI should be 16777215

[Nischal Sheth]

The maximum possible value for VNI should be increased from 1048575
(2^20 - 1) to 16777215 (2^24 - 1) in schema and UI.

The old maximum was based on the assumption that only the top 20 bits
of the 3-byte label in the EVPN route would be used as VNI, analogous
to how MPLS labels are encoded/decoded. However, the EVPN+VXLAN spec
now clarifies that all 24 bits are to be used.

The BGP signaling changes have been implemented via bug 1464781.

Only implement post 2.20-fcs since this will need end-to-end testing.

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/12331
Submitter: Sachin Bansal (<email address hidden>)

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/12368
Submitter: Sachin Bansal (<email address hidden>)

[OpenContrail Admin (ci-admin-f)]

Reviewed: https://review.opencontrail.org/12368
Committed: http://github.org/Juniper/contrail-controller/commit/fb4706617e04478d8f27c1026693353c5ceac72a
Submitter: Zuul
Branch: R2.22-dev

commit fb4706617e04478d8f27c1026693353c5ceac72a
Author: Sachin Bansal <email address hidden>
Date: Fri Jul 10 14:27:26 2015 -0700

Change max value of vni to 2^24-1

Change-Id: I99e359958708be6f729252cb7a496b35630d9461
Closes-Bug: 1466177
(cherry picked from commit d17861df6f82c84351de9130ed5efe3cb6b44e5d)

[OpenContrail Admin (ci-admin-f)]

Reviewed: https://review.opencontrail.org/12331
Committed: http://github.org/Juniper/contrail-controller/commit/029b4c28dddc72fd83de44124b60bad329047f4b
Submitter: Zuul
Branch: master

commit 029b4c28dddc72fd83de44124b60bad329047f4b
Author: Sachin Bansal <email address hidden>
Date: Fri Jul 10 14:27:26 2015 -0700

Change max value of vni to 2^24-1

Change-Id: I99e359958708be6f729252cb7a496b35630d9461
Closes-Bug: 1466177

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/13139
Submitter: Nischal Sheth (<email address hidden>)

[OpenContrail Admin (ci-admin-f)]

Reviewed: https://review.opencontrail.org/13139
Committed: http://github.org/Juniper/contrail-controller/commit/a5421e8b45769345ac77c235f6a3bd51872dc27f
Submitter: Zuul
Branch: R2.20

commit a5421e8b45769345ac77c235f6a3bd51872dc27f
Author: Sachin Bansal <email address hidden>
Date: Fri Jul 10 14:27:26 2015 -0700

Change max value of vni to 2^24-1

Change-Id: I99e359958708be6f729252cb7a496b35630d9461
Closes-Bug: 1466177

[Nischal Sheth (nsheth)]

Schema changes are done - need to change the UI.

[Nischal Sheth (nsheth)]

UI change is tracked by bug 1486679.