[wildfly-dev] deployment-scanner rollback behavior change

As part of WFLY-364 [1] we changed the default behavior of the deployment-scanner to not rollback on deployment failures. The main reason behind this is that a deployment failure would also trigger the rollback of a potentially unrelated deployment, if it's deployed as part of the same "scan". This basically means failed deployments remain visible through the management model in in a failed state. This is also the same behavior used when booting WildFly. Beside that we still write the appropriate .failure marker for the failed deployment(s), so there should be no other impact from a user POV. There is also a configuration attribute in the deployment-scanner subsystem to disable this if this is not wanted. Given that changes to the deployment-scanner often caused issues for people, i wanted to double check that there are not objections to this. Thanks, Emanuel [1] https://issues.jboss.org/browse/WFLY-364