Add support for external snapshots to system tests

Registered by Artur Kaszuba

We need to create changes in system test code to start use external snapshots. This change will be used to reduce amount of data required to copy over network in import/export system tests environments functionality. With separated files for each stage of test we can copy only required parts, we don't need to copy one big qcow file.

Blueprint information

Status:
Not started
Approver:
Aleksandra Fedorova
Priority:
Undefined
Drafter:
Artur Kaszuba
Direction:
Needs approval
Assignee:
Aliaksei Cherniakou
Definition:
New
Series goal:
None
Implementation:
Unknown
Milestone target:
None

Related branches

Sprints

Whiteboard

Gerrit topic: https://review.openstack.org/#q,topic:system-test-external-snapshots,n,z

Addressed by: https://review.openstack.org/245087
    Add information about usage of external snapshots

Addressed by: https://review.openstack.org/235566
    Add partial support for external snapshots

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