Increase swap size to 4GB

The ceph jobs are failing apparently due to mysqld being reaped by
the oom reaper, which of course cascades into service failures due
to db errors.  Increasing the swap size allows the jobs to run to
completion.

Default is 1G.  See other patches on topic: increase-swap to see
how 4G was determined.

Change-Id: Ibf2a7fd2a305d04303b1288a6f1faebfc9ffd6de
1 file changed