Thanks for report. I thought that I fix it in the past. Obviously I have forgotten to fix it. Probably it will be fixed in next cycle (in date of RHEL 7.4 GA).

(In reply to jcastran from comment #0)
> If I change the delimiter to "|" and cut the third field, the update will
> continue.
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>   pkgs="$(echo $line | cut -d "|" -f3 | tr "," " ")"
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> The only thing I couldn't think of was how to cut off the first line (its
> just informational and yum has "can't install "new_pkg"" which is just the
> column title

You can add line with grep to skip the comment line before line you mentioned.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  echo "$line" | grep -q "^#" && continue
  pkgs="$(echo $line | cut -d "|" -f3 | tr "," " ")"
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

I remember that there was one another problem yet, but can't get it now. I will post patch here when I will look at it. In addition, the script is really slow, when you have a lot of packages. So I want to improve it much more. The fix is not urgent, because user don't have to use this script, but can install all packages manually - as it was only possible way before and with own parsing, it can be much faster now.

==============================================================
Verified in:
    preupgrade-assistant-2.4.1-1.el6.noarch
    preupgrade-assistant-el6toel7-0.6.70-2.el6.noarch
    preupgrade-assistant-el6toel7-data-0.20170620-1.el6.noarch
PASS
==============================================================

>> Patch was checked and applied.

# rpm -q libdb-cxx
package libdb-cxx is not installed

>> Upgrade machine to RHEL-7

# cd /root/preupgrade/noauto_postupgrade.d/
# ./install_rpmlist.sh  /root/preupgrade/kickstart/RHRHEL7rpmlist_replaced-notbase 
Loaded plugins: product-id, search-disabled-repos, subscription-manager
This system is not registered with an entitlement server. You can use subscription-manager to register.
redhat-upgrade-cmdline-instrepo                                                   | 4.1 kB  00:00:00     
redhat-upgrade-optional                                                           | 3.8 kB  00:00:00     
Package m17n-db-extras-1.6.4-3.el7.noarch already installed and latest version
Nothing to do
Info: all packages have been installed successfully.

# yum install libdb-cxx
Loaded plugins: product-id, search-disabled-repos, subscription-manager
This system is not registered with an entitlement server. You can use subscription-manager to register.
Package libdb-cxx-5.3.21-20.el7.x86_64 already installed and latest version
Nothing to do

==============================================================
Reproduced in:
    preupgrade-assistant-2.3.3-2.el6.noarch
    preupgrade-assistant-el6toel7-0.6.66-3.el6.noarch
    preupgrade-assistant-el6toel7-data-0.20170218-1.el6.noarch
FAIL
==============================================================

# rpm -q libdb-cxx
package libdb-cxx is not installed

>> Upgrade machine to RHEL-7

# cd /root/preupgrade/noauto_postupgrade.d/
# ./install_rpmlist.sh /root/preupgrade/kickstart/RHRHEL7rpmlist_replaced-notbase
Loaded plugins: product-id, search-disabled-repos, subscription-manager
This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
redhat-upgrade-cmdline-instrepo                                                   | 4.1 kB  00:00:00     
redhat-upgrade-optional                                                           | 3.8 kB  00:00:00     
No package # available.
Error: Nothing to do
Error: The packages [#] were not installed.
Loaded plugins: product-id, search-disabled-repos, subscription-manager
This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
No package db4-cxx||libdb-cxx|rhel-7-server-optional-rpms available.
Error: Nothing to do
Error: The packages [db4-cxx||libdb-cxx|rhel-7-server-optional-rpms] were not installed.
Loaded plugins: product-id, search-disabled-repos, subscription-manager
This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
No package m17n-db-datafiles||m17n-db-extras|rhel-7-server-optional-rpms available.
Error: Nothing to do
Error: The packages [m17n-db-datafiles||m17n-db-extras|rhel-7-server-optional-rpms] were not installed.

# rpm -q install libdb-cxx
package install is not installed
libdb-cxx-5.3.21-19.el7.x86_64

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2017:2400