test: Set the overcommit_memory to 1.

Signed-off-by: Blaž Hrastnik <blaz.hrast@gmail.com>
test: Increase test box sizes to 1GB of RAM.

Signed-off-by: Blaž Hrastnik <blaz.hrast@gmail.com>
Merge pull request #429 from flynn/test-vm-tweaks

Test VM tweaks