[WFLY-543] : Provide an operation to request service status report after server has been started

Adding the new command "read-boot-errors" available from core-service=management to list all operations that failed during boot.
It displays all boot errors with the failed operation and the failure description / exception of the error.
Jira: https://issues.jboss.org/browse/WFLY-543
This should hide the invisible part of the address rather than the entire error. See https://github.com/wildfly/wildfly-core/blob/master/domain-management/src/main/java/org/jboss/as/domain/management/controller/SecureOperationReadHandler.java#L56 for an example.