Only check for /var/lib/mongodb if it is mounted
Only check for /var/lib/mongodb if it is mounted

If MongoDB's data is not on an encrypted filesystem
(`$licensify_mongo_encrypted` is false), then there's no need to check
the `/var/lib/mongodb` mountpoint since that directory will be part of
the root partition.

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