SSDM-13578 : 2PT : Database and V3 Implementation - restore and cleanup

.../java/ch/ethz/sis/transaction/TransactionCoordinator.java

.../java/ch/ethz/sis/transaction/TransactionParticipant.java

...ource/java/ch/ethz/sis/transaction/TransactionStatus.java

...a/ch/ethz/sis/transaction/TransactionCoordinatorTest.java

...a/ch/ethz/sis/transaction/TransactionParticipantTest.java

...is/generic/server/asapi/v3/TransactionCoordinatorApi.java

...is/generic/server/asapi/v3/TransactionParticipantApi.java

...ethz/sis/openbis/systemtest/asapi/v3/TransactionTest.java