strip: also backup obsmarkers

We are about to give 'strip' the ability to remove obsmarkers. Before we start
removing data we must make sure it is preserved somewhere. So the backup bundle
created by 'strip' now contains obsmarkers.

mercurial/repair.py

@@ -49,7 +49,7 b' def _bundle(repo, bases, heads, node, su'
         bundletype = "HG10UN"
 
     outgoing = discovery.outgoing(repo, missingroots=bases, missingheads=heads)
-    contentopts = {'cg.version': cgversion}
+    contentopts = {'cg.version': cgversion, 'obsolescence': True}
     return bundle2.writenewbundle(repo.ui, repo, 'strip', name, bundletype,
                                   outgoing, contentopts, vfs, compression=comp)
 

tests/test-obsolete.t

@@ -1184,6 +1184,17 b' Test ability to pull changeset with loca'
   $ hg log -G --hidden
   @  0:a78f55e5508c (draft) [tip ] 0
   
+  $ hg debugbundle .hg/strip-backup/e016b03fd86f-c41c6bcc-backup.hg
+  Stream params: sortdict([('Compression', 'BZ')])
+  changegroup -- "sortdict([('version', '02'), ('nbchanges', '4')])"
+      e016b03fd86fcccc54817d120b90b751aaf367d6
+      e008cf2834908e5d6b0f792a9d4b0e2272260fb8
+      f27abbcc1f77fb409cf9160482fe619541e2d605
+      b0551702f918510f01ae838ab03a463054c67b46
+  obsmarkers -- 'sortdict()'
+      version: 1 (139 bytes)
+      e008cf2834908e5d6b0f792a9d4b0e2272260fb8 b0551702f918510f01ae838ab03a463054c67b46 0 (Thu Jan 01 00:00:00 1970 +0000) {'user': 'test'}
+      f27abbcc1f77fb409cf9160482fe619541e2d605 0 {e008cf2834908e5d6b0f792a9d4b0e2272260fb8} (Thu Jan 01 00:00:00 1970 +0000) {'user': 'test'}
 
   $ hg pull .hg/strip-backup/*
   pulling from .hg/strip-backup/e016b03fd86f-c41c6bcc-backup.hg