streamclone: partially encode filename over the wire, not for local read (
issue1847)
(Fixes
issue1847, which was introduced by
810387f59696: stream clone
of a repo with directory named *.d failed: server raises exception
"IOError: [Errno 2] No such file or directory:
/tmp/test/.hg/store/data/foo.d.hg.hg/foo".)