Open Stack

With tempest change [1] the multiattach tests are enabled in 
tempest-full, tempest-full-py3 and tempest-slow job configurations. This 
was to allow dropping the nova-multiattach job and still retain test 
coverage in the upstream gate.

There are 3rd party CI jobs that are basing their job configs on these 
tempest job configs, and as a result they will now fail if the storage 
backend driver does not support multiattach volumes and the job 
configuration does not override and set:

   ENABLE_VOLUME_MULTIATTACH: false

in the tempest job config, like was done in the 
devstack-plugin-ceph-tempest jobs [2].

Let me know if there are any questions.

[1] https://review.openstack.org/#/c/606978/
[2] https://review.openstack.org/#/c/634977/

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Thanks,

Matt