All host metrics not being collected by AMS if user does not have permissions to read mount point.

Traceback (most recent call last):
  File "/usr/lib64/python2.7/threading.py", line 811, in __bootstrap_inner
    self.run()
  File "/usr/lib64/python2.7/threading.py", line 1083, in run
    self.function(*self.args, **self.kwargs)
  File "/usr/lib/python2.6/site-packages/resource_monitoring/core/metric_collector.py", line 45, in process_event
    self.process_host_collection_event(event)
  File "/usr/lib/python2.6/site-packages/resource_monitoring/core/metric_collector.py", line 76, in process_host_collection_event
    metrics.update(self.host_info.get_combined_disk_usage())
  File "/usr/lib/python2.6/site-packages/resource_monitoring/core/host_info.py", line 188, in get_combined_disk_usage
    usage = psutil.disk_usage(part.mountpoint)
  File "/usr/lib/python2.6/site-packages/resource_monitoring/psutil/build/lib.linux-x86_64-2.7/psutil/__init__.py", line 1690, in disk_usage
    return _psplatform.disk_usage(path)
  File "/usr/lib/python2.6/site-packages/resource_monitoring/psutil/build/lib.linux-x86_64-2.7/psutil/_psposix.py", line 121, in disk_usage
    st = os.statvfs(path)
OSError: [Errno 13] Permission denied: '/abc/def/mountpoint'

[root@ctr-e45-1475874954070-13451-01-000004 ~]# ls -lrt /abc/def/mountpoint
total 4
drwx--x--- 4 nobody 3004   36 Oct 26 07:20 filecache
drwxr-s--- 5 nobody 3004 4096 Oct 26 07:21 container_e45_1475874954070_13451_01_000004