redhat70 mainline sanity failed due to failed dependency on concurrent.futures

[Jeba Paulaiyan]

3.0 2698 juno Sanity

setup_without_openstack failed as follows:

Traceback (most recent call last):
  File "/usr/bin/contrail-analytics-api", line 9, in <module>
    load_entry_point('opserver==0.1dev', 'console_scripts', 'contrail-analytics-api')()
  File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 378, in load_entry_point
    return get_distribution(dist).load_entry_point(group, name)
  File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 2566, in load_entry_point
    return ep.load()
  File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 2260, in load
    entry = __import__(self.module_name, globals(),globals(), ['__name__'])
  File "/usr/lib/python2.7/site-packages/opserver/opserver.py", line 36, in <module>
    from analytics_db import AnalyticsDb
  File "/usr/lib/python2.7/site-packages/opserver/analytics_db.py", line 29, in <module>
    from cassandra.cluster import Cluster
  File "cassandra/cluster.py", line 23, in init cassandra.cluster (cassandra/cluster.c:70648)
ImportError: No module named concurrent.futures

Looks like this dependency is introduced by https://github.com/Juniper/contrail-packaging/commit/02ef0d69a3a8e9decd1f3eecbdc8bbfd795852c9

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/16332
Submitter: Arvind (<email address hidden>)

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/16452
Submitter: Arvind (<email address hidden>)

[OpenContrail Admin (ci-admin-f)]

Reviewed: https://review.opencontrail.org/16452
Committed: http://github.org/Juniper/contrail-packaging/commit/3c4fd107aac90c59f94a6ee09c45b3080e28e9e3
Submitter: Zuul
Branch: master

commit 3c4fd107aac90c59f94a6ee09c45b3080e28e9e3
Author: arvindvis <email address hidden>
Date: Sat Jan 23 11:53:17 2016 -0800

Adding dependency on concurrent.futures to python-cassandra
Adding python-cassandra to vcenter
Closes-Bug: 1534259

Change-Id: I99f3114da88ab507043b6fb279185ce2f5b4d174