* do not swallow exception triggered inside SWA handling
--> write it to the log
The real change is in src/com/sap/piper/Utils.groovy
All the changes in the tests are dealing with mocking the echo method
used in the Utils class mentioned above.
read yaml rule is a very frequently used rule. But having the rule in the common rules
means we cannot register text or files to that rule, which makes it less handy to work
with yaml files in the tests.