Revert "After tempest network resource do not be cleared"

This reverts commit 264a6029db225716e11fbb5fd7b3014459b869b1.
We use pre-provisioned OpenStack projects (accounts, users and networks)
to run multi-tenancy tests against the DHSS=True drivers. When using
the NeutronNetworkPlugin (or its derivatives),
share servers are not expected to be deleted by the tests. This
assumption breaks the cleanup committed in 264a6029db225716e11fbb5fd7b3014459b869b1.

We ought to clean up share servers that get created as part of test runs
because we clean up all the shares. The default option to teardown
"unused" share servers [1] currently takes care of freeing up
share servers after the tests have run.

If network resources pertain to pre-provisioned
projects, no cleanup should be done by manila's tempest tests; since
they are meant to be administered by the test runner (human/automation).

[1] https://docs.openstack.org/manila/latest/configuration/shared-file-systems/config-options.html 

Related-Bug: #1755467
Change-Id: I004d88e4e2ccf5a0e1dbaaedc7195f5a8e427559
1 file changed