Switch test_volume_boot_pattern to using full image
Test test_volume_boot_pattern boots several vms from the same volume,
cirros cloud init may fail sometimes to download ssh key,
so switching to full image similar to test_snapshot_pattern.
When using full image we need to sync filesystem caches before
doing snapshot in order to make sure network storage consumed
all changes.
Related-Prod: https://mirantis.jira.com/browse/PRODX-40320
Change-Id: If3b26f58fe6526c1372d0e4d84db598cebeb5b0e
(cherry picked from commit 8c9da257700baa7fa672fa0b7134e56d25aec039)
4 files changed