Adjust RAM for Vagrant nodes
Adjust RAM for Vagrant nodes

The new PuppetLabs base box introduced in ab1fd8a has a default of 2048M
RAM. That's quite thirsty if you plan to run three or more nodes at the same
time.

Bump them all down to a default of 384M and specify one as 512M to
demonstrate that it can be overridden.

alphagov/govuk_mirror-puppet,alphagov/govuk_mirror-puppet,boffbowsh/ci-puppet,alphagov/govuk_mirror-puppet,gds-attic/govuk_redirector-puppet,boffbowsh/ci-puppet,gds-operations/puppet-skeleton,alphagov/ci-puppet,alphagov/govuk_offsitebackups-puppet,boffbowsh/ci-puppet,alexmuller/puppet-lighfe,op-ct/puppet-skeleton,alexmuller/puppet-lighfe,russmckendrick/puppet-skeleton,alphagov/ci-puppet,alphagov/ci-puppet,boffbowsh/ci-puppet,alphagov/govuk_offsitebackups-puppet,alphagov/ci-puppet