lint job fails because of some classes are still included by absolute names

[zhongshengping]

2020-07-30 14:25:57.106396 | ubuntu-bionic | ----------------------------------------------------------
2020-07-30 14:25:59.920400 | ubuntu-bionic | manifests/db.pp:153:WARNING: class included by absolute name (::$class)
2020-07-30 14:25:59.920449 | ubuntu-bionic | manifests/db.pp:154:WARNING: class included by absolute name (::$class)
2020-07-30 14:25:59.920458 | ubuntu-bionic | manifests/db.pp:163:WARNING: class included by absolute name (::$class)

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/744086

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/744086
Committed: https://git.openstack.org/cgit/openstack/puppet-oslo/commit/?id=7f8072b361f90654b9249b19c4cc17d22dcad8e6
Submitter: Zuul
Branch: master

commit 7f8072b361f90654b9249b19c4cc17d22dcad8e6
Author: ZhongShengping <[e-mail]>
Date: Fri Jul 31 09:59:50 2020 +0800

    Fix lint errors

    Change to relative include, which is now mandatory.

    Change-Id: I860995937ac218166383a4d2fb49546d611e39f2
    Closes-Bug: #1889702