CentOS template does not include 'man' command

[misterzed88]

Qubes OS version:

R4.0

Affected component(s):

qubes-builder-rpm

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Steps to reproduce the behavior:

1. Use qubes-builder to build and install the centos-7 template.
2. From a terminal in the template, attempt to run man.
3. There is an error message due to missing command.

General notes:

The 'man' command is missing due to the man-db package not being included in the template. A workaround is to add 'man-db' to builder-rpm/template_scripts/packages_centos7.list.

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