Revert "This check should run everywhere, so reenable it inside AWS"
Revert "This check should run everywhere, so reenable it inside AWS"

This reverts commit 1dbe03b7d3681bccbb3c3aad791e16081fe55939, since it
has lead to false alerts in all AWS environments, due to the hostname
'puppetdb.cluster' not resolving. We should fix this before re-enabling
the alert in AWS. Code reference from the plugin we're using:

https://github.com/alphagov/nagios-plugins/blob/master/plugins/command/check_puppetdb_ssh_host_keys.py#L22

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