Move Nagios app process checks inside condition
Move Nagios app process checks inside condition

The collectd only collects process stats if the app type is
`rack` or `bare`. The nagios checks that depend on this should
also be in this condition.

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