OpenShift Update Service is not getting registry certificates in OpenShift 4

Issue

• The graph-builder container in the service pods contains errors like the following ones with message unable to get local issuer certificate, unable to get issuer certificate or self signed certificate:

  ERROR graph_builder::graph] failed to fetch all release metadata from <test-registry>:8443/<image>
  ERROR graph_builder::graph] http transport error: error sending request for url (<test-registry>:8443/v2/): error trying to connect: error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed:ssl/statem/statem_clnt.c:1915: (unable to get issuer certificate)
  ERROR graph_builder::graph] error sending request for url (<test-registry>:8443/v2/): error trying to connect: error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed:ssl/statem/statem_clnt.c:1915: (unable to get issuer certificate)
  ERROR graph_builder::graph] error trying to connect: error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed:ssl/statem/statem_clnt.c:1915: (unable to get issuer certificate)
  ERROR graph_builder::graph] error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed:ssl/statem/statem_clnt.c:1915: (unable to get issuer certificate)
  

  DEBUG cincinnati::plugins::internal::graph_builder::commons] unable to process certificate ca-bundle.trust.crt: builder error: error:0909006C:PEM routines:get_name:no start line:crypto/pem/pem_lib.c:745:Expecting: CERTIFICATE
  ERROR graph_builder::graph] failed to fetch all release metadata from <test-registry>:8443/<image>
  ERROR graph_builder::graph] http transport error: error sending request for url (<test-registry>:8443/v2/): error trying to connect: error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed:ssl/statem/statem_clnt.c:1915: (self signed certificate in certificate chain)