oeqa/selftest/cases/tinfoil.py: increase timeout 10->60s test_wait_event

The test would timeout on autobuilders. This patch increases the
timeout to 60s

The test will now also exit as soon as we receive the 2 expected events
Expected runtime is around 1s if successful

Bug 14158

Signed-off-by: Yi Fan Yu <yifan.yu@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>