docs: Release notes for ptest updates
Signed-off-by: David Brown <david.brown@linaro.org>
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+- Update ptest to support test selection. Ptest can now be invoked with `list`
+ to show the available tests and `run` to run them. The `-t` argument will
+ select specific tests to run.
+- Allow sim tests to skip slow tests. By setting `MCUBOOT_SKIP_SLOW_TESTS` in
+ the environment, the sim will skip two tests that are very slow. In one
+ instance this reduces the test time from 2 hours to about 5 minutes. These
+ slow tests are useful, in that they test bad powerdown recovery, but are
+ inconvenient when testing other areas.