This change ensures that the new gpg key for puppet packages[1] are
install before installing puppet-agent, so that we can install any
package signed with the new gpg key.
[1] https://puppet.com/blog/updated-puppet-gpg-signing-key-2020-edition/
Closes-Bug: #1912871
Change-Id: I015770275192d9834e38593e249b472f56d7ccd4
(cherry picked from commit 3f3da39c68)