Releasing Voldemort 1.9.4
create admin api to return read-only storage file list
RO tool that tells (1)source fileName(2)source node(3)fileName at destination

This is important for RO host swap where SRE's need to find out where to copy the
from and what to name it on the destination node
Productionize ReadOnlyReplicationHelper

- Rename ReadOnlyHostSwapCLI -> REadOnlyReplicationHelper
- Create unit test to verify the correctness
- Change input from Cluster to BootstrapUrl to fit admin environment
- Fix bugs and re-format help menu
Add column names to the info printed by the tool