Avoid get_pool_attrs in select_io_group for non hyperswap pools

[Chhavi Agarwal]

currently select_io_group makes the get_pool_attrs each time, the pool_data fetched here is only required to verify for hyperswap enabled pools

We can have this call conditionally called if volume_topology is enabled for hyperswap

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/745576

[katari manoj kumar (katarimanojkumar)]

gerrit link : https://review.opendev.org/#/c/745576/

[katari manoj kumar (katarimanojkumar)]

This change is made to avoid unnecessary CLI calls that reduces the performance during bulk operations
My customer has negative impact due to these performance issues.
With this bugfix, time taken by group snapshot/clone operation for 100 non-hyperswap volumes reduced by 28 secs.

This change will also reduce time taken for creating non-hyperswap volumes.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/745576
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=e554a61844800b61ceb4ddb4fc86ffb3d7f2ed37
Submitter: Zuul
Branch: master

commit e554a61844800b61ceb4ddb4fc86ffb3d7f2ed37
Author: katarimanojkumar <email address hidden>
Date: Mon Aug 10 19:07:27 2020 +0000

    [storwize]:Fixed select_io_group issues

    Fixed issues in select_io_group that impacts the performance during
    Create_volume, Group Snapshot/Clone operations for bulk
    non-hyperswap volumes.

    select_io_grp can avoid get_pool_attrs if the topology is not
    hyperswap.

    closes bug: #1890588

    Change-Id: Ibee878cfe86c82ad4c79247f2a3bd37f08be80b8