Description of problem:
===
- OpenShift(Golang) doesn't support enough ciphers suites.
- The customer's environment(Windows AD) only allow:

    DHE-RSA-AES256-GCM-SHA384
    DHE-RSA-AES128-GCM-SHA256
    AES256-GCM-SHA384
    AES128-GCM-SHA256

- We need to use OpenShift's LDAPS authentication with these cipher suites.

Version-Release number of selected component (if applicable):
===
- OCP(OSE) 3.2

Additional info:
===
- The error message in Windows AD side is "An TLS 1.2 connection request was received from a remote client application, but none of the cipher suites supported by the client application are supported by the server. The SSL connection request has failed."

- We confirmed that signature algorithm is sha256, so it is not the issue in https://access.redhat.com/solutions/2525721

  $ openssl x509 -in ldaps.crt -text -noout
      ...
      Signature Algorithm: sha256WithRSAEncryption

- We confirmed that AD administrator temporarily enabled TLS_RSA_WITH_AES_128_CBC_SHA and TLS_RSA_WITH_AES_256_CBC_SHA and it worked fine. However, they don't allow these ciphers in production environment.

- Above requested cipher suites are included in TLS v1.2 cipher list.
  TLS v1.2 cipher suites - https://www.openssl.org/docs/manmaster/apps/ciphers.html
  (e.g) TLS_DHE_RSA_WITH_AES_256_GCM_SHA384       DHE-RSA-AES256-GCM-SHA384