t9146: use 'svn_cmd' wrapper
t9146: use 'svn_cmd' wrapper

Using 'svn' directly may not work for all users.

Signed-off-by: Eric Wong <8c2951295f8292b0c03727bc4652981172298eae@yhbt.net>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git