{} are valid characters in test description, but they're not escaped
properly in python string format(). To resolve the bug of KeyError
when it tries to log test description which contains {}, we replace
{XXX} format with {{XXX}} in order to escape {} in python string
format() properly.
In addition, the calls to Results.log() are also handled to avoid
similar potential problems.
Signed-off-by: Yanray Wang <yanray.wang@arm.com>
0e319ae577