[PATCH] test/test-lib.sh: fix two out of tree test issues

[David Bremner]

Tomi Ollila <tomi.ollila at iki.fi> writes:

> json_check_nodes.py exists in source tree, not in out of tree
> build tree. Added -B to the execution so source tree is not
> "polluted" by a .pyc file when json_check_nodes.py is executed.
>

pushed to master