py3: use absolute_import in test-hgweb-auth.py

tests/test-check-py3-compat.t

@@ -56,7 +56,6 b''
   tests/test-demandimport.py not using absolute_import
   tests/test-demandimport.py requires print_function
   tests/test-doctest.py not using absolute_import
-  tests/test-hgweb-auth.py not using absolute_import
   tests/test-hgweb-auth.py requires print_function
   tests/test-hgwebdir-paths.py not using absolute_import
   tests/test-hybridencode.py not using absolute_import

tests/test-hgweb-auth.py

@@ -1,8 +1,15 b''
+from __future__ import absolute_import
+
 from mercurial import demandimport; demandimport.enable()
 import urllib2
-from mercurial import ui, util
-from mercurial import url
-from mercurial.error import Abort
+from mercurial import (
+    ui,
+    url,
+    util,
+)
+from mercurial.error import (
+    Abort,
+)
 
 class myui(ui.ui):
     def interactive(self):