Rename tserver specific split properties

[keith-turner]

In #3382 the process of moving split from the tserver to manager was started. When its fully moved, need to rename split properties that have tserver in the name. Below is a TODO from #3382 about this

accumulo/server/manager/src/main/java/org/apache/accumulo/manager/split/SplitUtils.java

Line 208 in 808c0bb

// ELASTICITY_TODO rename and deprecate property. This is not executing in the tablet server

There may be more properties identified when everything is moved to the manager and the code is removed from the tserver.

[dlmarion]

@keith-turner - I think this can be closed, I'm not seeing any more tserver specific split properties in Property.java