there was a lot of duplicate code in ConsoleDebugger and
AndroidDebugger, which resides now in AbstractDebugger. Those two and
the new JulDebugger subclass AbstractDebugger.
Thanks to Stefan Karlsson for helping with the implementation.
Also add SASLMechanism.checkIfSuccessfulOrThrow(), to increase the
security by verifying the mechanisms state at the end of SASL
authentication.
SASLMechanism now has a SASLPrep StringTransformer.
Refactor SHA1 functions out of StringUtils into SHA1 utility class.
Add MAC utility class.
Make DummyConnection getSentpacket() methods use generics to make unit
testing SCRAM-SHA1 easier.
Fixes SMACK-398
If a user enabled Smack debug via the property 'smack.debugEnabled', a
ConnectionConfiguration could be created where debuggerEnabled is
'false', because Smack is not yet initialized.
Also make sure that if the property is not set, it won't overwrite
DEBUG_ENABLED = true.
Thanks to William Murphy for providing a detailed issue description and
supposing a fix.