How to install Capsule for Red Hat Satellite 6 with certificate signed by different Certification Authority (CA)

Issue

• Capsule server installation fails when the Capsule server uses certificates signed by a different CA root trust than the Red Hat Satellite server.

• Capsule installation fails with:

  Could not set 'present' on ensure: 422 Unprocessable Entity at 12:/usr/share/katello-installer/modules/foreman_proxy/manifests/register.pp
  /Stage[main]/Foreman_proxy::Register/Foreman_smartproxy[capsule.domain2.local]/ensure: change from absent to present failed: Could not set 'present' on ensure: 422 Unprocessable Entity at 12:/usr/share/katello-installer/modules/foreman_proxy/manifests/register.pp
  

• The Foreman log on Satellite reports SSL verification errors:

  [E] Unprocessable entity SmartProxy (id: new):
   Unable to communicate with the proxy: ERF12-2530 [ProxyAPI::ProxyException]: Unable to detect features ([OpenSSL::SSL::SSLError]: SSL_connect returned=1 errno=0 state=SSLv3 read server certificate B: certificate verif...) for proxy https://capsule.domain2.local:9090/features
  

  This occurs because Satellite does not trust the CA that signed the Capsule certificates