[openstack|network] remove superfluous Router model attributes

See #1603
[aws] mock update_server_certificate
Merge pull request #1683 from bvox/openstack-router-fixes

[openstack|network] remove superfluous Router model attributes
Merge pull request #1677 from engineyard/update-server-certificate

[aws] mock update_server_certificate
Merge branch 'master' of github.com:fog/fog into auth_deux