repozo: fix recover on stdout (#405)

This was working on python2, but on python3,

  repozo -v --recover --repository backups/ > restored.fs

failed with

  TypeError: write() argument must be str, not bytes

CHANGES.rst

@@ -5,6 +5,8 @@
 6.0.1 (unreleased)
 ==================
 
+ - repozo: fix restoring on stdout.
+
  - repozo: prevent an incorrect "option ignored" warning when running backup or verify.
 
 

src/ZODB/scripts/repozo.py

@@ -685,7 +685,7 @@ def do_recover(options):
     files_to_close = ()
     if options.output is None:
         log('Recovering file to stdout')
-        outfp = sys.stdout
+        outfp = sys.stdout.buffer
     else:
         # Delete old ZODB before recovering backup as size of
         # old ZODB + full partial file may be superior to free disk space