[vDNS: VM do not get default DNS IP if IPAM dns method is not set

[Pulkit Tandon]

R4.0 - Build 20

Created a VN and associated a subnet with it.
The subnet to be part of default IPAM

Created a VM.
Observed that VM has no value for name server in resolv.conf

Created a vDNS server and attached it to default IPAM.
Spawned another VM and observed that the VM gets the server IP correctly.

Debugging:
When we do not explicitly set a DNS server method in IPAM, it is set to empty ("").
Somehow, due to some change, it is getting set to "None"

Parsing None is not a part of code. Thus, change is required while setting "IPAM_dns_method" in schema.

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/33119
Submitter: Hari Prasad Killi (<email address hidden>)

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/33123
Submitter: Hari Prasad Killi (<email address hidden>)

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/33124
Submitter: Hari Prasad Killi (<email address hidden>)

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/33125
Submitter: Hari Prasad Killi (<email address hidden>)

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/33126
Submitter: Hari Prasad Killi (<email address hidden>)

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/33128
Submitter: Hari Prasad Killi (<email address hidden>)

[OpenContrail Admin (ci-admin-f)]

Reviewed: https://review.opencontrail.org/33124
Committed: http://github.com/Juniper/contrail-controller/commit/095f4dc5c7de41313a9cf8691f436c38a831ee42
Submitter: Zuul (<email address hidden>)
Branch: R3.2

commit 095f4dc5c7de41313a9cf8691f436c38a831ee42
Author: Hari Prasad Killi <email address hidden>
Date: Fri Jun 23 11:59:26 2017 +0530

If IPAM DNS mode is set to none, consider it as default DNS mode.

Change-Id: Ia60c141ccdaabef814cc97ccb28be3db7bb6e969
closes-bug: #1699983

[OpenContrail Admin (ci-admin-f)]

Reviewed: https://review.opencontrail.org/33125
Committed: http://github.com/Juniper/contrail-controller/commit/4f69b38cdeb168323106f3e07b3bc0015854d7a5
Submitter: Zuul (<email address hidden>)
Branch: R3.2.3.x

commit 4f69b38cdeb168323106f3e07b3bc0015854d7a5
Author: Hari Prasad Killi <email address hidden>
Date: Fri Jun 23 11:59:26 2017 +0530

If IPAM DNS mode is set to none, consider it as default DNS mode.

Change-Id: Ia60c141ccdaabef814cc97ccb28be3db7bb6e969
closes-bug: #1699983

[OpenContrail Admin (ci-admin-f)]

Reviewed: https://review.opencontrail.org/33126
Committed: http://github.com/Juniper/contrail-controller/commit/d7180ab15a5cae188a130073d608d0eaf589ce9b
Submitter: Zuul (<email address hidden>)
Branch: R3.1

commit d7180ab15a5cae188a130073d608d0eaf589ce9b
Author: Hari Prasad Killi <email address hidden>
Date: Fri Jun 23 11:59:26 2017 +0530

If IPAM DNS mode is set to none, consider it as default DNS mode.

Change-Id: Ia60c141ccdaabef814cc97ccb28be3db7bb6e969
closes-bug: #1699983

[OpenContrail Admin (ci-admin-f)]

Reviewed: https://review.opencontrail.org/33128
Committed: http://github.com/Juniper/contrail-controller/commit/6bb29989e2e95ecc7e575a47d81fbfd30cf65ec6
Submitter: Zuul (<email address hidden>)
Branch: R3.0

commit 6bb29989e2e95ecc7e575a47d81fbfd30cf65ec6
Author: Hari Prasad Killi <email address hidden>
Date: Fri Jun 23 11:59:26 2017 +0530

If IPAM DNS mode is set to none, consider it as default DNS mode.

Change-Id: Ia60c141ccdaabef814cc97ccb28be3db7bb6e969
closes-bug: #1699983

[OpenContrail Admin (ci-admin-f)]

Reviewed: https://review.opencontrail.org/33119
Committed: http://github.com/Juniper/contrail-controller/commit/3235ff310419401af9d976940c84c54ca4a80954
Submitter: Zuul (<email address hidden>)
Branch: master

commit 3235ff310419401af9d976940c84c54ca4a80954
Author: Hari Prasad Killi <email address hidden>
Date: Fri Jun 23 11:59:26 2017 +0530

If IPAM DNS mode is set to none, consider it as default DNS mode.

Change-Id: Ia60c141ccdaabef814cc97ccb28be3db7bb6e969
closes-bug: #1699983

[OpenContrail Admin (ci-admin-f)]

Reviewed: https://review.opencontrail.org/33123
Committed: http://github.com/Juniper/contrail-controller/commit/39d196ab007b2d1c24e418f7cce60fa19ec9cd46
Submitter: Zuul (<email address hidden>)
Branch: R4.0

commit 39d196ab007b2d1c24e418f7cce60fa19ec9cd46
Author: Hari Prasad Killi <email address hidden>
Date: Fri Jun 23 11:59:26 2017 +0530

If IPAM DNS mode is set to none, consider it as default DNS mode.

Change-Id: Ia60c141ccdaabef814cc97ccb28be3db7bb6e969
closes-bug: #1699983

[Pulkit Tandon (pulkitt)]

Verified on following build:

4.0.1.0-23

Found working. Hence closing the bug