Move xattr handling into libgsystem, fix sysroot to handle directory ownership/perms

This large patch moves the core xattr logic down into libgsystem,
which allows the gs_shutil_cp_a() API to copy them.  In turn, this
allows us to just use that API instead of rolling our own recursive
copy here.

As noted in the new comment though, one case that we are explicitly
regressing is where the new /etc removes a parent directory that's
needed by a modified file.  This seems unlikely for most vendors now,
but let's do that as a separate bug.

https://bugzilla.gnome.org/show_bug.cgi?id=711058

src/libostree/ostree-core.h

@@ -167,11 +167,6 @@ void ostree_object_from_string (const char *str,
                                 gchar     **out_checksum,
                                 OstreeObjectType *out_objtype);
 
-gboolean ostree_get_xattrs_for_file (GFile         *f,
-                                     GVariant     **out_xattrs,
-                                     GCancellable  *cancellable,
-                                     GError       **error);
-
 gboolean
 ostree_content_stream_parse (gboolean                compressed,
                              GInputStream           *input,