Default slack to newest plugin config format

Change-Id: I2685190d08cf8f7b02ffbe5c1b26ec1d3ed40074
Signed-off-by: Thanh Ha <thanh.ha@linuxfoundation.org>

jenkins_jobs/modules/publishers.py

@@ -27,6 +27,7 @@ the build is complete.
 
 import logging
 import pkg_resources
+import sys
 import xml.etree.ElementTree as XML
 
 import six
@@ -6480,7 +6481,9 @@ def slack(registry, xml_parent, data):
     logger = logging.getLogger(__name__)
 
     plugin_info = registry.get_plugin_info('Slack Notification Plugin')
-    plugin_ver = pkg_resources.parse_version(plugin_info.get('version', "0"))
+    # Note: Assume latest version of plugin is preferred config format
+    plugin_ver = pkg_resources.parse_version(
+        plugin_info.get('version', str(sys.maxsize)))
 
     mapping = (
         ('team-domain', 'teamDomain', ''),

tests/publishers/fixtures/slack001.plugins_info.yaml

@@ -0,0 +1,3 @@
+- longName: 'Slack Notification Plugin'
+  shortName: 'slack'
+  version: "1.0"

tests/publishers/fixtures/slack002.plugins_info.yaml

@@ -0,0 +1,3 @@
+- longName: 'Slack Notification Plugin'
+  shortName: 'slack'
+  version: "1.0"