httppeer: close the temporary bundle file after two-way streaming it

This fixes several push tests in test-bundle2-exchange.t that were failing on
Windows with messages like the following:

   $ hg -R main push http://localhost:$HGPORT2/ -r 32af7686d403 \
        --bookmark book_32af
   pushing to http://localhost:$HGPORT2/
   searching for changes
   remote: adding changesets
   remote: adding manifests
   remote: adding file changes
   remote: added 1 changesets with 1 changes to 1 files
   remote: 1 new obsolescence markers
   updating bookmark book_32af
   abort: The process cannot access the file because it is being used by another
            process: 'C:\path\to\tmp\bundle.hg'
   [255]

mercurial/httppeer.py

@@ -214,6 +214,7 b' class httppeer(wireproto.wirepeer):'
 
     def _calltwowaystream(self, cmd, fp, **args):
         fh = None
+        fp_ = None
         filename = None
         try:
             # dump bundle to disk
@@ -225,10 +226,12 b' class httppeer(wireproto.wirepeer):'
                 d = fp.read(4096)
             fh.close()
             # start http push
-            fp = httpconnection.httpsendfile(self.ui, filename, "rb")
+            fp_ = httpconnection.httpsendfile(self.ui, filename, "rb")
             headers = {'Content-Type': 'application/mercurial-0.1'}
-            return self._callstream(cmd, data=fp, headers=headers, **args)
+            return self._callstream(cmd, data=fp_, headers=headers, **args)
         finally:
+            if fp_ is not None:
+                fp_.close()
             if fh is not None:
                 fh.close()
                 os.unlink(filename)