Increase Puppetserver RAM
Increase Puppetserver RAM

- 6G max heap causes the machine to crash from time to time.

- Had to give the machine 16G RAM, so might as well use it - doubling max
heap to 12G

solo: da39a3ee5e6b4b0d3255bfef95601890afd80709@schmie

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