Remove ca_cert option after ssl_ca_file is set
Remove ca_cert option after ssl_ca_file is set

[#113922541](https://www.pivotaltracker.com/story/show/113922541)

Signed-off-by: Felix Riegger <9c2aa7530239a330bbac6ac4f56e0946781dfd29@sap.com>

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