This patchset adds the LDAP connector in the dex chart value where it
can be customized to connect to the lab's ITTESTSERVICES LDAP instance.
The certificates needed by Dex is generated by Cert-Manager in the Ephemeral cluster (Secret named
dex-apiserver-secret) and this Secret is then moved to the Target cluster through the command
"airshipctl phase run clusterctl-move".
This Secret (i.e., tls.crt) is used by API server for the OIDC plugin configuration, which MUST
be done on the KubeadmControlPlane resource in the Ephemeral cluster.
This patchset implements the Approach 1 described in https://hackmd.io/bdPFHBBSQy-IrpPe1U9itg.
Change-Id: I58419cad6b8d770285ceb84a3a3a0e8b3380ef15