Description of problem:

We see the following when we run /usr/share/rhn/virtualization/poller.pyc:
Traceback (most recent call last):
  File "/usr/lib64/python2.6/runpy.py", line 122, in _run_module_as_main
    "__main__", fname, loader, pkg_name)
  File "/usr/lib64/python2.6/runpy.py", line 34, in _run_code
    exec code in run_globals
  File "/usr/lib64/python2.6/trace.py", line 823, in <module>
    main()
  File "/usr/lib64/python2.6/trace.py", line 811, in main
    t.runctx(code, globs, globs)
  File "/usr/lib64/python2.6/trace.py", line 512, in runctx
    exec cmd in globals, locals
  File "/usr/share/rhn/virtualization/poller.py", line 290, in <module>
    domain_list = poll_through_vdsm()
  File "/usr/share/rhn/virtualization/poller.py", line 140, in poll_through_vdsm
    import localvdsm
  File "/usr/share/rhn/virtualization/localvdsm.py", line 35, in <module>
    raise ImportError('local vdsm not found')

ENV:
  RHE:-H 6.3
  vdsm-4.9-113.1.el6.x86_64
  rhn-virtualization-common-5.4.14-9.el6sat.noarch

Version-Release number of selected component (if applicable):
  rhn-virtualization-host-5.4.14-9.el6sat.noarch  
  rhn-virtualization-common-5.4.14-9.el6sat.noarch
  vdsm-4.9-113.1.el6.x86_64

How reproducible:
  Always

Steps to Reproduce:
  Install on the latest RHEL-H and run
    # python /usr/share/rhn/virtualization/poller.py
  
Actual results:
  Traceback (most recent call last):
  File "/usr/lib64/python2.6/runpy.py", line 122, in _run_module_as_main
    "__main__", fname, loader, pkg_name)
  File "/usr/lib64/python2.6/runpy.py", line 34, in _run_code
    exec code in run_globals
  File "/usr/lib64/python2.6/trace.py", line 823, in <module>
    main()
  File "/usr/lib64/python2.6/trace.py", line 811, in main
    t.runctx(code, globs, globs)
  File "/usr/lib64/python2.6/trace.py", line 512, in runctx
    exec cmd in globals, locals
  File "/usr/share/rhn/virtualization/poller.py", line 290, in <module>
    domain_list = poll_through_vdsm()
  File "/usr/share/rhn/virtualization/poller.py", line 140, in poll_through_vdsm
    import localvdsm
  File "/usr/share/rhn/virtualization/localvdsm.py", line 35, in <module>
    raise ImportError('local vdsm not found')

Expected results:
  No exception. The script should be able to connect to the local VDSM

Additional info:

I did some research and I found out the this is issue is most probably located in /usr/share/vdsm/config.py. This is loaded in localvdsm.py that is loaded by poller.py
We try to import module "constants" and then use some constants from the module
   grep -n constants /usr/share/vdsm/config.py
     3:import constants
     69:config.set('vars', 'trust_store_path', constants.P_TRUSTSTORE)
     131:config.set('irs', 'pools_data_dir', constants.P_STORAGEPOOLS)
     133:config.set('irs', 'lock_util_path', constants.P_VDSM_LIBEXEC)
     140:config.set('irs', 'md_backup_dir', constants.P_VDSM_BACKUP)
     166:config.read([constants.P_VDSM_CONF + 'vdsm.conf'])

The constants module that we are interested in is located in /usr/share/vdsm/constants.py
The problem is that there is also a constants module located in /usr/share/rhn/virtualization/constants.py that is loaded by /usr/share/rhn/virtualization/poller.py
So we end up with a wrong module loaded.