Fix exceptions not to be strings

Signed-off-by: Lucas Meneghel Rodrigues <lucasmr@br.ibm.com>



git-svn-id: http://test.kernel.org/svn/autotest/trunk@1157 592f7852-d20e-0410-864c-8624ca9c26a4
diff --git a/server/utils.py b/server/utils.py
index 94b9c69..40ac670 100644
--- a/server/utils.py
+++ b/server/utils.py
@@ -341,7 +341,7 @@
 	for key in dictionary.keys():
 		value = '%s' % dictionary[key]     # convert numbers to strings
 		if re.search(r'\W', key):
-			raise 'Invalid key: ' + key
+			raise ValueError('Invalid key: %s' % key)
 		keyval.write('%s=%s\n' % (key, str(value)))
 	keyval.close()