Create a user for upcoming ITHC usage
Merge pull request #603 from alphagov/feature/ithc-configuration

Create a user for upcoming ITHC usage
Include collectd before adding mongo collectd

Because we're using variables from $::collectd::params we need to
include collectd first.
Fix typo on new user config
Merge pull request #605 from alphagov/fix-typo-in-user

Fix typo on new user config
Merge pull request #604 from alphagov/fix-mongo-collectd

Include collectd before adding mongo collectd