<oo-admin-yum-validator> Bug 1029325, implicitly set client role for broker role
https://bugzilla.redhat.com/show_bug.cgi?id=1029325

Added logic to set `client` role in `self.opts.role` when `broker`
role is specified, similar to how `node-eap` implies `node` role
Merge pull request #184 from dobbymoodge/BZ1029325

<oo-admin-yum-validator> Bug 1029325, implicitly set client role for broker role