webdav: add StripPrefix.

Change-Id: I38ac4a507cb79d4295c58f2d8c891e5bdcf0c1e4
Reviewed-on: https://go-review.googlesource.com/10379
Reviewed-by: Robert Stepanek <robert.stepanek@gmail.com>
Reviewed-by: Nigel Tao <nigeltao@golang.org>
2 files changed