tests: update test-log-exthook to pass our import checker

tests/test-log-exthook.t

@@ -1,56 +1,60 b''
 Test hg log changeset printer external hook
 -------------------------------------------
 
   $ cat > $TESTTMP/logexthook.py <<EOF
-  > from mercurial import repair, commands
-  > from mercurial import cmdutil
+  > from __future__ import absolute_import
+  > from mercurial import (
+  >   cmdutil,
+  >   commands,
+  >   repair,
+  > )
   > def rot13description(self, ctx):
   >     summary = "summary".encode('rot13')
   >     description = ctx.description().strip().splitlines()[0].encode('rot13')
   >     self.ui.write("%s:     %s\n" % (summary, description))
   > def reposetup(ui, repo):
   >     cmdutil.changeset_printer._exthook = rot13description
   > EOF
 
 Prepare the repository
 
   $ hg init empty
   $ cd empty
   $ touch ROOT
   $ hg commit -A -m "Root" ROOT
 
   $ touch a b c
   $ hg commit -A -m "Add A, B, C" a b c
 
 Check the log
 
   $ hg log --config extensions.t=$TESTTMP/logexthook.py
   changeset:   1:70fc82b23320
   tag:         tip
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   fhzznel:     Nqq N, O, P
   summary:     Add A, B, C
   
   changeset:   0:b00443a54871
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
   fhzznel:     Ebbg
   summary:     Root
   
 Check that exthook is working with graph log too
 
   $ hg log -G --config extensions.t=$TESTTMP/logexthook.py
   @  changeset:   1:70fc82b23320
   |  tag:         tip
   |  user:        test
   |  date:        Thu Jan 01 00:00:00 1970 +0000
   |  fhzznel:     Nqq N, O, P
   |  summary:     Add A, B, C
   |
   o  changeset:   0:b00443a54871
      user:        test
      date:        Thu Jan 01 00:00:00 1970 +0000
      fhzznel:     Ebbg
      summary:     Root