Use find_candidate_files() to determine which candidates to validate

We have utils.find_candidate_files() which correctly detects the type of
election and returns the appropriate list of files.  Lets use that
so limit the CI checks we do.

Change-Id: I36ccfa82137d0f05a031ab2a50dd4eb87a32094b

openstack_election/cmds/ci_check_all_candidate_files.py

@@ -15,7 +15,6 @@ from __future__ import print_function
 from __future__ import unicode_literals
 
 import argparse
-import glob
 import os
 
 from openstack_election import check_candidacy
@@ -100,8 +99,7 @@ def main():
 
     projects = utils.get_projects(tag=args.tag, fallback_to_master=True)
 
-    for filepath in glob.glob(os.path.join(utils.CANDIDATE_PATH,
-                                           args.release, '*', '*')):
+    for filepath in utils.find_candidate_files(election=args.release):
         candidate_ok = True
 
         candidate_ok &= validate_filename(filepath)