[JAVA] Adding a 2nd property to check on PrintTokens2
Adding an equivalence-check from the PrintTokens program. This PR also makes changes recommended in #860.
- the license for this benchmark is the same as the license used for other benchmarks already in the java-ranger-regression folder
- As already mentioned in the README, this benchmark was originally contributed by Wang et al. this new benchmark would be in the java-ranger-regression folder which is present in ReachSafety.set
- assert.prp is the property file used
- printtokens_prop1.yml and printtokens_prop2.yml are the newly introduced task definition files. The implementation has been moved to the impl folder. prop1/ and prop2/ contain the implementation specific to the two properties.