Description of problem:
Database server hourly cron pointed at non-existent maintenance script upon migration from 4.5 to 4.6

Have not tested 5.8 minor update from when we change the location of database scripts, but should probably look into that as well.

Version-Release number of selected component (if applicable):
5.8.x (before db migration) to 5.9.x

How reproducible:
Always

Steps to Reproduce:
1.  Turn on DB maintenance scripts on 5.8
2.  Migrate from 5.8 to 5.9
3.  

Actual results:

The following shows up in mail after upgrade:

From root.redhat.com  Mon Jun 11 16:01:03 2018
Return-Path: <root>
X-Original-To: root
Delivered-To: root
Received: by example.com (Postfix, from userid 0)
	id 6DD5918581E0; Mon, 11 Jun 2018 16:01:03 -0400 (EDT)
From: "(Cron Daemon)" <root>
To: root.redhat.com
Subject: Cron <root@example> run-parts /etc/cron.hourly
Content-Type: text/plain; charset=UTF-8
Auto-Submitted: auto-generated
Precedence: bulk
X-Cron-Env: <XDG_SESSION_ID=5>
X-Cron-Env: <XDG_RUNTIME_DIR=/run/user/0>
X-Cron-Env: <LANG=en_US.UTF-8>
X-Cron-Env: <SHELL=/bin/bash>
X-Cron-Env: <PATH=/sbin:/bin:/usr/sbin:/usr/bin>
X-Cron-Env: <MAILTO=root>
X-Cron-Env: <HOME=/root>
X-Cron-Env: <LOGNAME=root>
X-Cron-Env: <USER=root>
Message-Id: <20180611200103.6DD5918581E0>
Date: Mon, 11 Jun 2018 16:01:02 -0400 (EDT)

/etc/cron.hourly/miq-pg-maintenance-hourly.cron:

/etc/cron.hourly/miq-pg-maintenance-hourly.cron: line 2: /usr/bin/hourly_reindex_metrics_tables: No such file or directory
/etc/cron.hourly/miq-pg-maintenance-hourly.cron: line 3: /usr/bin/hourly_reindex_miq_queue_table: No such file or directory
/etc/cron.hourly/miq-pg-maintenance-hourly.cron: line 4: /usr/bin/hourly_reindex_miq_workers_table: No such file or directory

Expected results:
Crons are cleaned up/migrated/deleted

Additional info:
Was able to reproduce locally.