tests-extra: fix letter-case handling in Server.use_keys()

tests-extra/tests/dnssec/no_resign/test.py

@@ -24,6 +24,7 @@ master.dnssec_enable = True
 master.use_keys(nsec_zone)
 master.use_keys(nsec3_zone)
 master.gen_confile()
+t.sleep(2)
 master.reload()
 
 t.sleep(4)

tests-extra/tools/dnstest/server.py

@@ -634,7 +634,7 @@ class Server(object):
 
         src_files = os.listdir(zone.key_dir)
         for file_name in src_files:
-            if zone.name[:-1] in file_name:
+            if (zone.name[:-1]).lower() in file_name:
                 full_file_name = os.path.join(zone.key_dir, file_name)
                 if (os.path.isfile(full_file_name)):
                     shutil.copy(full_file_name, self.keydir)