tmetadata.py: chmod tree before deletion to fix NetBSD test failure.
tmetadata.py: chmod tree before deletion to fix NetBSD test failure.

Apparently NetBSD won't let you recursively delete a parent directory
containing a 000 subdirectory, so "chmod -R u+rwX" the tree first.

Signed-off-by: Thomas Klausner <4f8f608ac4aafcbe4fab8dcee1e9c609f99d9332@giga.or.at>
[1dc5917c2adeeba13d1ef33dbb40691a1b67cc65@defaultvalue.org: adjust commit message.]
Reviewed-by: Rob Browning <1dc5917c2adeeba13d1ef33dbb40691a1b67cc65@defaultvalue.org>

tjanez/bup,jbaber/bup,tjanez/bup,mhoeher/bup,ToxicFrog/bup,gevaerts/bup,ToxicFrog/bup,jbaber/bup,tjanez/bup,ToxicFrog/bup,ToxicFrog/bup,mhoeher/bup,gevaerts/bup,mhoeher/bup,ToxicFrog/bup,jbaber/bup,jbaber/bup,pombredanne/bup,mhoeher/bup,mhoeher/bup,pombredanne/bup,gevaerts/bup,tjanez/bup,pombredanne/bup,pombredanne/bup,pombredanne/bup,gevaerts/bup,pombredanne/bup,gevaerts/bup,mhoeher/bup,tjanez/bup,tjanez/bup,jbaber/bup,jbaber/bup