Clear host_href

Setting a specific url to href makes barbican return that single url
regardless of the actual endpoint used. This sometimes causes wrong
redirect (especially when a client uses admin url or internal url).

Set it to a blank value so that barbican uses the auto-detected
endpoint url, which is changed according to the real end point used.

Change-Id: Icf656b1004a0f94c724353c3de7e17fdd5af1a81
Signed-off-by: Takashi Kajinami <kajinamit@oss.nttdata.com>

templates/barbican.conf.j2

@@ -8,9 +8,8 @@ use_stderr = False
 debug = {{ debug }}
 
 # Host name, for use in HATEOAS-style references
-#  Note: Typically this would be the load balanced endpoint that clients would use
-#  communicate back with this service.
-host_href = {{ barbican_service_publicurl }}
+#  Note: This is cleared so that the auto-detected endpoint url is used.
+host_href =
 
 transport_url = {{ barbican_oslomsg_rpc_transport }}://{% for host in barbican_oslomsg_rpc_servers.split(',') %}{{ barbican_oslomsg_rpc_userid }}:{{ barbican_oslomsg_rpc_password }}@{{ host }}:{{ barbican_oslomsg_rpc_port }}{% if not loop.last %},{% else %}/{{ _barbican_oslomsg_rpc_vhost_conf }}{% if barbican_oslomsg_rpc_use_ssl | bool %}?ssl=1&ssl_version={{ barbican_oslomsg_rpc_ssl_version }}&ssl_ca_file={{ barbican_oslomsg_rpc_ssl_ca_file }}{% else %}?ssl=0{% endif %}{% endif %}{% endfor %}