test-{service,host}-plugin: only expect krbcanonicalname when all=True

fixes incorrect assertions in tests that create, retrieve, and search for
services

https://fedorahosted.org/freeipa/ticket/3864

Reviewed-By: Lenka Doudova <ldoudova@redhat.com>

ipatests/test_xmlrpc/test_host_plugin.py

@@ -357,7 +357,6 @@ class TestHostWithService(XMLRPC_test):
                 result=dict(
                     dn=service1dn,
                     krbprincipalname=[service1],
-                    krbcanonicalname=[service1],
                     objectclass=objectclasses.service,
                     managedby_host=[host.fqdn],
                     ipauniqueid=[fuzzy_uuid],