Increase swap size for lvm-barbican jobs

Increase the swap size used by the cinder-tempest-plugin-lvm-barbican
family of jobs by setting it to 8GB in the
cinder-tempest-plugin-lvm-barbican-base-abstract job definition.

Also increase for ctp-lvm-multiattach job, which has been hitting
OOM errors.

See https://review.opendev.org/q/topic:caracal-gate for how we
arrived at 8GB as a suitable value for these jobs.

Change-Id: Id560bc3d078ce2ccbd87b32c317bf61cc519a92a
1 file changed