[RHV] The vdsmd service reports fasteners ModuleNotFoundError error

Issue

The vdsmd service on the RHV host reports following error

# systemctl status vdsmd
● vdsmd.service - Virtual Desktop Server Manager
   Loaded: loaded (/usr/lib/systemd/system/vdsmd.service; enabled; vendor preset: disabled)
   Main PID: 3560151 (vdsmd)
   CGroup: /system.slice/vdsmd.service
           ├─3560151 /usr/bin/python3 /usr/libexec/vdsm/vdsmd
           ├─3560369 /usr/libexec/ioprocess --read-pipe-fd 52 --write-pipe-fd 51 --max-threads 10 --max-queued-requests 10
           ├─3560372 /usr/libexec/ioprocess --read-pipe-fd 57 --write-pipe-fd 56 --max-threads 10 --max-queued-requests 10
           ├─3560379 /usr/libexec/ioprocess --read-pipe-fd 63 --write-pipe-fd 62 --max-threads 10 --max-queued-requests 10
           └─3560386 /usr/libexec/ioprocess --read-pipe-fd 69 --write-pipe-fd 68 --max-threads 10 --max-queued-requests 10

May 08 12:15:37 test vdsm[3560151]: ERROR Error getting managedvolume connector info: Managed Volume Helper failed.: ('Error ex>
                                          Traceback (most recent call last):
                                      File "/usr/lib/python3.6/site-packages/vdsm/host/caps.py", line 175, in get
                                              caps["connector_info"] = managedvolume.connector_info()
                                      File "/usr/lib/python3.6/site-packages/vdsm/storage/managedvolume.py", line 80, in wrapper
                                              return func(*args, **kwargs)
                                      File "/usr/lib/python3.6/site-packages/vdsm/storage/managedvolume.py", line 95, in connec>
                                              return run_helper("connector_info")
                                      File "/usr/lib/python3.6/site-packages/vdsm/storage/managedvolume.py", line 201, in run_h>
                                              sub_cmd, cmd_input=cmd_input)
                                      File "/usr/lib/python3.6/site-packages/vdsm/common/supervdsm.py", line 56, in __call__
                                              return callMethod()
                                      File "/usr/lib/python3.6/site-packages/vdsm/common/supervdsm.py", line 54, in <lambda>
                                              **kwargs)
                                      File "<string>", line 2, in managedvolume_run_helper
                                      File "/usr/lib64/python3.6/multiprocessing/managers.py", line 772, in _callmethod
                                              raise convert_to_error(kind, result)
                                           vdsm.storage.exception.ManagedVolumeHelperFailed: Managed Volume Helper failed.: ('Error executing helper: Command [\'/usr/bin/python3\', \'/usr/libexec/vdsm/managedvolume-
                                          helper\', \'connector_info\'] failed with rc=1 out=b\'\' err=b\'Traceback (most recent call last):\\n  File "/usr/libexec/vdsm/managedvolume-helper", line 41, in <module>\\n    from 
                                          os_brick.initiator import connector\\n  File "/usr/lib/python3.6/site-packages/os_brick/initiator/connector.py", line 27, in <module>\\n    from oslo_concurrency import lockutils\\n  File 
                                           "/usr/lib/python3.6/site-packages/oslo_concurrency/lockutils.py", line 27, in <module>\\n    import fasteners\\nModuleNotFoundError: No module named \\\'fasteners\\\'\\n\'',)