Remove RedHat specific class and implement anonymous_ftp subclass

https://bugzilla.redhat.com/show_bug.cgi?id=965889
Testing .log_status should not blindly call .log_system_status

MiqServer.log_system_status does a lot of shelling out.
Merge pull request #162 from brandondunne/file_depot_blind_ftp

Remove RedHat specific class and implement anonymous_ftp subclass
Merge pull request #163 from chessbyte/fix_miq_server_status_management_spec

Testing .log_status should not blindly call .log_system_status