EEXIST stack trace when removing measures files

[Danek Duvall]

I'm getting this stack trace in the gnocchi-metricd logs:

    [-] Error processing new measures
    Traceback (most recent call last):
      File ".../gnocchi/storage/_carbonara.py", line 434, in process_measures
        ts.serialize())
      File "/usr/lib/python2.7/contextlib.py", line 24, in __exit__
        self.gen.next()
      File ".../gnocchi/storage/file.py", line 194, in _process_measure_for_metric
        self._delete_measures_files_for_metric_id(metric.id, files)
      File ".../gnocchi/storage/file.py", line 167, in _delete_measures_files_for_metric_id
        os.rmdir(self._build_measure_path(metric_id))
    OSError: [Errno 17] File exists: '/var/lib/gnocchi/measure/a9a09b69-58d0-4edb-a944-8f492cf7dcc1'

This is because on Solaris, rmdir() sets errno to EEXIST when there are entries in the directory you're trying to remove, not ENOTEMPTY.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/364601

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/364601
Committed: https://git.openstack.org/cgit/openstack/gnocchi/commit/?id=10fd2690d46f12709b9666ffd602843a666e94ed
Submitter: Jenkins
Branch: master

commit 10fd2690d46f12709b9666ffd602843a666e94ed
Author: Danek Duvall <email address hidden>
Date: Thu Sep 1 17:26:53 2016 -0700

    Ignore EEXIST when removing measures directories

    On Linux, rmdir() sets errno to ENOTEMPTY when the directory is not
    empty. On Solaris, it sets errno to EEXIST. They should be treated
    equivalently here.

    Change-Id: I1024e757ac46936a421cc2a1013a0b5735747719
    Closes-Bug: #1619509