replica install: use one remote CA host name everywhere

Remote master and CA host names may differ. Always use the remote CA host
name and never the remote master host name in CA replica install.

https://fedorahosted.org/freeipa/ticket/6392

Reviewed-By: Stanislav Laznicka <slaznick@redhat.com>

ipaserver/install/server/replicainstall.py

@@ -549,9 +549,10 @@ def install_check(installer):
             raise ScriptError("Directory Manager password required")
 
     config = create_replica_config(dirman_password, filename, options)
-    installer._top_dir = config.top_dir
+    config.ca_host_name = config.master_host_name
     config.setup_ca = options.setup_ca
     config.setup_kra = options.setup_kra
+    installer._top_dir = config.top_dir
 
     ca_enabled = ipautil.file_exists(config.dir + "/cacert.p12")
 
@@ -576,7 +577,7 @@ def install_check(installer):
             fd.write("dogtag_version=10\n")
 
             if not config.setup_ca:
-                fd.write("ca_host={0}\n".format(config.master_host_name))
+                fd.write("ca_host={0}\n".format(config.ca_host_name))
         else:
             fd.write("enable_ra=False\n")
             fd.write("ra_plugin=none\n")
@@ -1258,7 +1259,8 @@ def promote_check(installer):
             config.subject_base = DN(subject_base)
 
         # Find if any server has a CA
-        ca_host = service.find_providing_server('CA', conn, api.env.server)
+        ca_host = service.find_providing_server(
+                'CA', conn, config.ca_host_name)
         if ca_host is not None:
             config.ca_host_name = ca_host
             ca_enabled = True