provision fails since preconfig.py does not configure /etc/hosts

[wenqing liang]

R3.2.5.0-35 mitaka provision fails with 404 because preconfig.py did not update /etc/hosts.

Aug 29 23:32:54 server1 puppet-agent[29277]: Unable to fetch my node definition, but the agent run will continue:
Aug 29 23:32:54 server1 puppet-agent[29277]: Find /production/node/server1?transaction_uuid=2b46a69a-7a35-4810-ba6d-bdb70f2bc3d8&fail_on_404=true resulted in 404 with the message: Not Found: Could not find node server1
Aug 29 23:32:55 server1 puppet-agent[29277]: Could not retrieve catalog from remote server: Error 400 on SERVER: Could not find node 'server1'; cannot compile
Aug 29 23:32:55 server1 puppet-agent[29277]: Not using cache on failed catalog
Aug 29 23:32:55 server1 puppet-agent[29277]: Could not retrieve catalog; skipping run
Aug 29 23:33:04 server1 puppet-agent[29503]: Unable to fetch my node definition, but the agent run will continue:

[Dheeraj Gautam (dgautam)]

This bug is not there in R4.0 and above. Only R3.2 has this issue and needs backporting of preconfig change from R4.0 to R3.2

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/35792
Submitter: Dheeraj Gautam (<email address hidden>)

[OpenContrail Admin (ci-admin-f)]

Reviewed: https://review.opencontrail.org/35792
Committed: http://github.com/Juniper/contrail-server-manager/commit/08bb8124df2d292b51523b43a9d482c6ba860586
Submitter: Zuul (<email address hidden>)
Branch: R3.2

commit 08bb8124df2d292b51523b43a9d482c6ba860586
Author: Dheeraj Gautam <email address hidden>
Date: Wed Sep 20 17:27:09 2017 -0700

preconfig.py should configured /etc/hosts as well

Closes-Bug: #1713906

code is picked from R4.0 preconfig.py

Change-Id: I25fd5a75b3567efa1c4b68f2e98f164d3def2ba3