Description of problem:
CDH images, for all those 3 versions, generated by sahara-image-pack and based on CentOS7.5/RHEL 7.5 returns errors when running the scenario tests. The same images generated by sahara-image-create from sahara-image-elements work. This was observed on Queens but it is probably the same on master, where the code did not diverge.

From the oozie logs it's not clear where the issue lies.

Excerpt of the logs:

The generated test file located at: /tmp/tmpM_lamv
/usr/lib/python2.7/site-packages/os_testr/ostestr.py:120: UserWarning: No .stestr.conf file found in the CWD. Please create one to to replace the .testr.conf. You can find a script to do this in the stestr git rep
ository.
  warnings.warn(msg)
Results of testing plugin cdh 5.11.0
20180424_111124
Traceback (most recent call last):

  File "/usr/lib/python2.7/site-packages/sahara_tests/scenario/base.py", line 62, in wrapper
    return fct(self, *args, **kwargs)

  File "/usr/lib/python2.7/site-packages/sahara_tests/scenario/base.py", line 222, in check_run_jobs
    self._job_batching(pre_exec)

  File "/usr/lib/python2.7/site-packages/sahara_tests/scenario/base.py", line 232, in _job_batching
    self._poll_jobs_status(job_exec_ids)

  File "/usr/lib/python2.7/site-packages/sahara_tests/scenario/base.py", line 343, in _poll_jobs_status
    self.fail("\n".join(report))

  File "/usr/lib/python2.7/site-packages/unittest2/case.py", line 666, in fail
    raise self.failureException(msg)

AssertionError: Job with id=1ba87077-0469-4a42-aef7-f2fd495fbe05, name=test-a62f378f, type=Pig has status KILLED
Job with id=f4a1ffa8-09b2-4c36-9366-b372fc8582ce, name=test-237e56d4, type=MapReduce has status KILLED
Job with id=c1fa2764-0cd1-4309-8bc4-5e58c3871be6, name=test-8971ee1b, type=MapReduce.Streaming has status KILLED
Job with id=c3b97cc8-4a39-444c-8efb-0a86037bedb6, name=test-7249054e, type=Spark has status DONEWITHERROR


+-----------------------------+--------+-------------+----------------------------+
| Check                       | Status | Duration, s |         Start time         |
+-----------------------------+--------+-------------+----------------------------+
| Create node group templates |   OK   |      5      | 2018-04-24 10:54:46.109545 |
| Set flavor                  |   OK   |      0      | 2018-04-24 10:54:46.546975 |
| Set flavor                  |   OK   |      0      | 2018-04-24 10:54:49.868471 |
| Set flavor                  |   OK   |      0      | 2018-04-24 10:54:50.160210 |
| Set flavor                  |   OK   |      0      | 2018-04-24 10:54:50.852614 |
| Set flavor                  |   OK   |      0      | 2018-04-24 10:54:51.161623 |
| Set flavor                  |   OK   |      0      | 2018-04-24 10:54:51.478533 |
| Create cluster template     |   OK   |      1      | 2018-04-24 10:54:51.787267 |
| Create cluster              |   OK   |      4      | 2018-04-24 10:54:53.406396 |
| Check cluster state         |   OK   |     813     | 2018-04-24 10:54:58.362200 |
| Check cinder volumes        |   OK   |      1      | 2018-04-24 11:08:32.355995 |
| Check event logs            |   OK   |      0      | 2018-04-24 11:08:33.584707 |
| Check EDP jobs              | FAILED |     171     | 2018-04-24 11:08:33.585016 |
| Check sentry                |   OK   |      0      | 2018-04-24 11:11:24.724782 |
+-----------------------------+--------+-------------+----------------------------+



Observed with :
openstack-sahara-8.0.1-0.20180328233736.36531cb.el7ost
openstack-sahara-tests-0.6.0-2.el7ost