Agent should advertise prefix for instance-ip based on alloc-unit

[Nischal Sheth]

Support for allocation unit was added via bug 1589588. An alloc-unit
field has been added to IpamSubnetType. The default value is 1.

Agent should advertise an IP prefix based on the alloc-unit value.
For example if an instance-ip has address 10.1.1.17 and alloc-unit
is 16, a route needs to be advertised for 10.1.1.16/28.

This should be supported for both inet and inet6 addresses.
It should also work in conjunction with the flat-subnet feature (see
bug 1592970).

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/21515
Submitter: RAVI KIRAN (<email address hidden>)

[OpenContrail Admin (ci-admin-f)]

Reviewed: https://review.opencontrail.org/21515
Committed: http://github.org/Juniper/contrail-controller/commit/eda15808d531850f2d5901d643e5d486be9d12aa
Submitter: Zuul
Branch: master

commit eda15808d531850f2d5901d643e5d486be9d12aa
Author: Ravi BK <email address hidden>
Date: Wed Jun 29 12:21:41 2016 +0530

Advertise Instance-ip with prefix using alloc-unit

Issue: There is a requirement of assigning alloc-block(power of 2)
vm instance-ip. Today we are creating UC routes for instance-ip
with /32 prefix. Now we need to create and advertise routes
for instance-ip with prefix calculated based on alloc-unit present
in IPAM configuration.
Fix: Store alloc-unit configuration in VnIpam structure and use
it while VM Interface is being created. Add UC route accordingly
and RouteExport will automatically exports the route.

Change-Id: I870a52b3bc732b5476bf17f75c46fe5599077d8a
Closes-Bug: #1595671

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/21723
Submitter: Manish Singh (<email address hidden>)

[OpenContrail Admin (ci-admin-f)]

Reviewed: https://review.opencontrail.org/21723
Committed: http://github.org/Juniper/contrail-controller/commit/e524ecce8704214d79d6f75a06b3763b9f7c31a1
Submitter: Zuul
Branch: master

commit e524ecce8704214d79d6f75a06b3763b9f7c31a1
Author: Manish <email address hidden>
Date: Thu Jul 7 21:45:52 2016 +0530

Fix UT.

Following commit modified installation of vm interface route. It is being
installed when IPAM is present. Test case had a test to check for evpn route and
inet route in absence of Ipam. That fails because of this commit. Fixing the
same.
https://github.com/Juniper/contrail-controller/commit/eda15808d531850f2d5901d643e5d486be9d12aa

Closes-bug: #1595671
Change-Id: Id1936792c0b36e9d1d46520b31330dc590dc7e90