Increase default VM memory size in define-vm.sh to 8Gb

When cfg01 node is booted from day01 image with jenkins and maas
services, 4Gb is not enough.

Change-Id: I44fddf5cfac35fbb90a73df6a2a93e0ffa267b1f
Closes-Bug: https://mirantis.jira.com/browse/PROD-19663
1 file changed
tree: 5c05a9441a07d6228d924c395b55af4dc2c0e1e5
  1. config-drive/
  2. mirror-image/
  3. predefine-vm/