domain-level agnostic keytab retrieval in httpinstance

apache keytab is now retrieved using the same method in both domain levels.
The difference lies in the authentication scheme used to retrieve service
keytab:

  * in DL0 passed in DM credentials are used
  * in DL1 GSSAPI is used

https://fedorahosted.org/freeipa/ticket/6405

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

ipaserver/install/server/replicainstall.py

@@ -76,23 +76,6 @@ def make_pkcs12_info(directory, cert_name, password_name):
         return None
 
 
-def install_http_keytab(config, fstore, remote_api):
-
-    # Obtain keytab for the HTTP service
-    fstore.backup_file(paths.IPA_KEYTAB)
-    try:
-        os.unlink(paths.IPA_KEYTAB)
-    except OSError:
-        pass
-
-    principal = 'HTTP/%s@%s' % (config.host_name, config.realm_name)
-    installutils.install_service_keytab(remote_api,
-                                        principal,
-                                        config.master_host_name,
-                                        paths.IPA_KEYTAB,
-                                        force_service_add=True)
-
-
 def install_http_certs(host_name, realm_name, subject_base):
     principal = 'HTTP/%s@%s' % (host_name, realm_name)
     # Obtain certificate for the HTTP service
@@ -1351,7 +1334,6 @@ def install(installer):
 
         if promote:
             # we need to install http certs to setup ssl for httpd
-            install_http_keytab(config, fstore, remote_api)
             install_http_certs(config.host_name,
                                config.realm_name,
                                config.subject_base)