pulp: Add rhel-7-server-rhui-optional-rpms as RHEL7 repo

[Spredzy]

The repository name provided by RHUI has changed in a recent update.

Before

[root@ip-10-0-12-140 yum.repos.d]# rpm -qa | grep rh-
rh-amazon-rhui-client-3.0.18-1.el7.noarch
[root@ip-10-0-12-140 yum.repos.d]# grep 'optional-rpms' redhat-rhui.repo
[rhui-rhel-7-server-rhui-optional-rpms]

Now

[root@ip-10-0-12-58 yum.repos.d]# rpm -qa | grep rh-
rh-amazon-rhui-client-3.0.28-1.el7.noarch
[root@ip-10-0-12-58 yum.repos.d]# grep 'optional-rpms' redhat-rhui.repo
[rhel-7-server-rhui-optional-rpms]

fixes #6960

[pulpbot]

Attached issue: https://pulp.plan.io/issues/6960

[mikedep333]

I am surprised they actually renamed it.

But I am glad I wrote this playbook to handle numerous possible names via the list variable. It turned out to not be over-engineering.

Thank you!