Allow MEP files when downloading locally from TestFileDB

This is needed for the HLT1 throughput test using the testbench setup that tests the production setup of HLT1. The Online MEP reader doesn't support reading directly from EOS.

Hlt/Moore/python/Moore/qmtest/context.py

@@ -114,7 +114,8 @@ def download_mdf_inputs_locally(urls, dest_dir, max_size=None):
             # prepend hash of full URL in case basenames are not unique
             basename = '{}_{}'.format(
                 hashlib.md5(url.encode()).hexdigest(), os.path.basename(url))
-            assert basename.endswith('.mdf') or basename.endswith('.raw')
+            assert basename.endswith('.mdf') or basename.endswith(
+                '.raw') or basename.endswith('.mep')
             dest = os.path.join(dest_dir, basename)
             src_size = xrd_size(url)
             size_to_copy = (min(src_size,