Remove unused registry properties
Remove unused registry properties

- the `registry.http.*` props are never used

[#128142495](https://www.pivotaltracker.com/story/show/128142495)

Signed-off-by: Mauro Morales <25a6413ced2a1dd68deb64edd538f9466d63d896@suse.com>

cloudfoundry-incubator/bosh-openstack-cpi-release,cloudfoundry-incubator/bosh-openstack-cpi-release,cloudfoundry-incubator/bosh-openstack-cpi-release