The test follows the example of test/e2e/pd.go. It expects, that the machine
that runs the test has OpenStack client tools installed and also that the
usual OpenStack authentication env. variables are set [1]
The test creates a new volume, inserts index.html there and checks, that
another pod can read it. The volume is deleted afterwards.
The test is disabled by default and it must be explicitly enabled.
1: http://docs.openstack.org/cli-reference/content/cli_openrc.html
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