http.manage: Fix passphrase prompt caption in --import-ca .

caucase/http.py

@@ -1013,11 +1013,11 @@ def manage(argv=None, stdout=sys.stdout):
     import_ca_dict = defaultdict(
       (lambda: {'crt': None, 'key': None, 'from': []}),
     )
-    for import_ca in args.import_ca:
-      with open(import_ca, 'rb') as ca_file:
+    for import_ca_path in args.import_ca:
+      with open(import_ca_path, 'rb') as ca_file:
         ca_data = ca_file.read()
       for index, component in enumerate(pem.parse(ca_data)):
-        name = '%r, block %i' % (import_ca, index)
+        name = '%r, block %i' % (import_ca_path, index)
         if isinstance(component, pem.Certificate):
           component_name = 'crt'
           component_value = x509.load_pem_x509_certificate(