hgweb: add test regarding filtering and hgweb

Since 4d1671b39168 hgweb is broken with filtering. This changeset add test that
should pass once it is fixed. Test currently broken are commented and will be
uncommented by changeset that fix them.

The filelog test is currently passing because we already have some hack in core
regarding filelog (see 518c1403838f).

tests/test-obsolete.t

@@ -643,16 +643,52 b' Do not warn about new head when the new '
   adding file changes
   added 1 changesets with 1 changes to 1 files (+1 heads)
 
+check hgweb does not explode
+====================================
+
+  $ hg unbundle $TESTDIR/bundles/hgweb+obs.hg
+  adding changesets
+  adding manifests
+  adding file changes
+  added 62 changesets with 63 changes to 9 files (+60 heads)
+  (run 'hg heads .' to see heads, 'hg merge' to merge)
+  $ for node in `hg log -r 'desc(babar_)' --template '{node}\n'`;
+  > do
+  >    hg debugobsolete $node
+  > done
+  $ hg up tip
+  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
+
+  $ hg serve -n test -p $HGPORT -d --pid-file=hg.pid -A access.log -E errors.log
+  $ cat hg.pid >> $DAEMON_PIDS
+
+#check changelog view
+#
+#  $ "$TESTDIR/get-with-headers.py" --headeronly localhost:$HGPORT 'shortlog/'
+#  200 Script output follows
+
+#check graph view
+#
+#  $ "$TESTDIR/get-with-headers.py" --headeronly localhost:$HGPORT 'graph'
+#  200 Script output follows
+
+check filelog view
+
+  $ "$TESTDIR/get-with-headers.py" --headeronly localhost:$HGPORT 'log/'`hg id --debug --id`/'babar'
+  200 Script output follows
+
+  $ kill `cat hg.pid`
+
 Checking _enable=False warning if obsolete marker exists
 
   $ echo '[extensions]' >> $HGRCPATH
   $ echo "obs=!" >> $HGRCPATH
   $ hg log -r tip
-  obsolete feature not enabled but 8 markers found!
-  changeset:   6:3de5eca88c00
+  obsolete feature not enabled but 68 markers found!
+  changeset:   68:c15e9edfca13
   tag:         tip
-  parent:      3:6f9641995072
+  parent:      7:50c51b361e60
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
-  summary:     add obsolete_e
+  summary:     add celestine