Tools depend on Node 0 to be available

Added a new override for getRemoteStoreDefList which takes no parameters
and identifies one of the nodes, for it to be used.

Fixed all the tools (not used in production code path but could be used
by SREs) code, which used NodeId 0 as default to use the new overload.

VoldemortMultiStoreBuildAndPushJob seems to have the issue, but not
sure, whether it is used in production, so just added the comment.
Merge pull request #211 from arunthirupathi/node0Issue

Tools depend on Node 0 to be available