Change database load balancer IP range to 10.1.0.0/16
Change database load balancer IP range to 10.1.0.0/16

Load balancers are distributed between availability zones, which
places them on different subnets.  10.1.5.0/24 is just one such
subnet, but there are others.

This is fine as we use security groups for actual security.

alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet