Updated task functionality

Updated task functionality

- run tests in groups: AWS4Test, BucketTest,ObjectTest
- do garbage collection via radosgw-admin before and after
each group to remove shadow objects and leftovers from multipart upoload
- add output forwarding of gradle to log and cat log file on completion
- switcehd from teardown to end method
- check for endpoint certificat and add it to the java keystore
- add s3tests-java.yaml task file to qa/suites/rgw/verify/tasks
- remove optional branch and repo and use default at ceph/java_s3tests

Signed-off-by: Antoaneta Damyanova <adamyanova@gmail.com>