Ignore EM releases in version-check.py

We don't want to use Extended Maintenance (EM) tags, since these are
just markers of a point in time and not available as released artifacts.

Change-Id: If552f7ffc22d4b25769c14c083179eecf5a93158
(cherry picked from commit f528ad8)

Author: markgoddard

tools/version-check.py

@@ -87,6 +87,10 @@ def load_all_info(openstack_release):
         if 'releases' in info and len(info['releases']) > 0:
             latest_release = info['releases'][-1]
             latest_version = latest_release['version']
+            if latest_version.endswith('-em') and len(info['releases']) > 1:
+                # Ignore Extended Maintenance (EM) releases, e.g. pike-em.
+                latest_release = info['releases'][-2]
+                latest_version = latest_release['version']
             for project in latest_release['projects']:
                 project_name = project['repo'].split('/')[-1]