Add missing Keystone params to without-mergepy

This patch adds the missing KeystoneSSLCertificate and
KeystoneSSLCertificateKey to overcloud-without-mergepy.yaml.

These parameters were adding to overcloud-source.yaml
in Icf46132230512a31b6dec3c07164c95b13dd8f73. Due to
the concurrent review window they never made it
into the new overcloud-without-mergepy.yaml
implementation.

Change-Id: I8b1155ca0a28392e5d5ade57d53bf810d8b5f053