Move reservations in FATE from memory into the persisted store

[keith-turner]

Currently the set of reserved fate transaction id is stored in memory. In #3964, reserving a fate transaction was moved from the in memory data structure into zookeeper. This change should be made on its own and the change needs to be made for the new Accumulo store also which did not exists when work on #3964 started. Doing this work in a stand alone PR will make the changes in #3964 smaller and easier to review and implement. #4114 is related

[kevinrr888]

I can work on this