py3: tests_xmlrpc: do not call str() on bytes

Calling str() on bytes causes undesired side effect: it adds prefix "b"
to the result of conversion. The method decode() should be used instead.

https://fedorahosted.org/freeipa/ticket/4985

Reviewed-By: Christian Heimes <cheimes@redhat.com>

ipatests/test_xmlrpc/test_caacl_profile_enforcement.py

@@ -434,7 +434,7 @@ def santest_csr(request, santest_host_1, santest_host_2):
         pkey, hashes.SHA256(), backend
     ).public_bytes(serialization.Encoding.PEM)
 
-    return unicode(csr)
+    return csr.decode('ascii')
 
 
 class SubjectAltNameOneServiceBase(XMLRPC_test):

ipatests/test_xmlrpc/test_kerberos_principal_aliases.py

@@ -260,7 +260,7 @@ class TestKerberosAliasExceptions(XMLRPC_test):
         # Add an alias overlapping the UPN of a trusted domain
         upn_suffix = (
             trusted_domain_with_suffix['ldif']['ipaNTAdditionalSuffixes']
-        )
+        ).decode('utf-8')
 
         with pytest.raises(errors.ValidationError):
             krbalias_user.add_principal(
@@ -278,7 +278,7 @@ class TestKerberosAliasExceptions(XMLRPC_test):
         # Add an alias overlapping the NETBIOS name of a trusted domain
         netbios_name = (
             trusted_domain_with_suffix['ldif']['ipaNTFlatName']
-        )
+        ).decode('utf-8')
 
         with pytest.raises(errors.ValidationError):
             krbalias_user.add_principal(