Revert "Merge pull request #2494 from gds/fix_keepalived_check_script"
Revert "Merge pull request #2494 from gds/fix_keepalived_check_script"

This reverts commit b3e0889e461f03b1084eb4b2ecd10d704bf5c49a, reversing
changes made to 366819b76ef6067a0e86ccf64cc8d731f30e40d3.

We're not yet using keepalived, so revert this to remove it.

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