Trim leading / off of paths in git-svn prop_walk

Trim leading / off of paths in git-svn prop_walk

prop_walk adds a leading / to all subdirectory paths. Unfortunately
this causes a problem when the remote repo lives in a subdirectory itself,
as the leading / causes subsequent PROPFIND calls to be executed on
the wrong path. Trimming the / before calling the PROPFIND fixes this problem.

Signed-off-by: Kevin Ballard <kevin@sb.org>
Acked-by: Eric Wong <normalperson@yhbt.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>