We have a utility for listing and removing FATE operations. ATM you have to run it by invoking the fully qualified classname.
In 1.4.x and 1.5.x this is org.apache.accumulo.server.fate.Admin. In 1.6+ it's org.apache.accumulo.master.util.FateAdmin
ACCUMULO-2519 its use is becoming a part of our upgrade instructions. the 1.4 -> 1.5 and 1.5 -> 1.6 instructions owuld have been easier if it was already exposed.
At a minimum we should add it for 1.6.0. I'm +0 on exposing it in earlier versions, since hte upgrade instructions wouldn't be able to refer to it anyways.