Get server hostname from jsonrpc_uri in ipa-certupdate

https://fedorahosted.org/freeipa/ticket/3259

Reviewed-By: Rob Crittenden <rcritten@redhat.com>

ipa-client/ipaclient/ipa_certupdate.py

@@ -20,6 +20,7 @@
 import os
 import tempfile
 import shutil
+import urlparse
 
 from ipapython import (admintool, ipautil, ipaldap, sysrestore, dogtag,
                        certmonger, certdb)
@@ -50,10 +51,7 @@ class CertUpdate(admintool.AdminTool):
         api.bootstrap(context='cli_installer')
         api.finalize()
 
-        try:
-            server = api.env.server
-        except AttributeError:
-            server = api.env.host
+        server = urlparse.urlsplit(api.env.jsonrpc_uri).hostname
         ldap = ipaldap.IPAdmin(server)
 
         tmpdir = tempfile.mkdtemp(prefix="tmp-")