Fix failure of replication_ssl test introduced by 297090d

Change `replication_ssl` to use the `wait_for_site_ips` function from the `replication` module introduced in 297090ded6c30ab04ae92b683f18ba4cc2507f11 instead of the defunct `verify_site_ips` function.

That change was part of #655 which was done to avoid a race condition in tests that rely on the site verification in the `replication` module. 

This change is in reponse to the failure seen [here](http://giddyup.basho.com/#/projects/riak_ee/scorecards/107/107-2095-replication_ssl-centos-6-64/54858/artifacts/947801).